ࡱ> PRMNOM sbjbj== ;WWolvvvvvvv"!"!"!8Z!v!L2!p#p#p#p#p#r$lN%8((((@>)T-T1$3 5 2v%p#p#%% 2'vvp#p#2.'''%"vp#vp#('%('X'(vv(p#! 6G "!%((M2<2(}7,~&9('vvvvDesigning a DatabaseUnderstanding Relational Design Contents  TOC \o "1-2" Overview  GOTOBUTTON _Toc348156598  PAGEREF _Toc348156598 1 The Database Design Process  GOTOBUTTON _Toc348156599  PAGEREF _Toc348156599 1 Steps in Designing a Database  GOTOBUTTON _Toc348156600  PAGEREF _Toc348156600 2 Common Design Problems  GOTOBUTTON _Toc348156601  PAGEREF _Toc348156601 3 Determining the Purpose  GOTOBUTTON _Toc348156602  PAGEREF _Toc348156602 3 Determining the Tables You Need  GOTOBUTTON _Toc348156603  PAGEREF _Toc348156603 4 Determining the Fields You Need  GOTOBUTTON _Toc348156604  PAGEREF _Toc348156604 6 Tips for Determining Fields  GOTOBUTTON _Toc348156605  PAGEREF _Toc348156605 6 Primary Key Fields  GOTOBUTTON _Toc348156606  PAGEREF _Toc348156606 8 Determining the Relationships  GOTOBUTTON _Toc348156607  PAGEREF _Toc348156607 9 Refining the Design  GOTOBUTTON _Toc348156608  PAGEREF _Toc348156608 15 Additional Reading and Practice  GOTOBUTTON _Toc348156609  PAGEREF _Toc348156609 Error! Bookmark not defined. Overview Microsoft Access provides a number of tools that you can use to create a relational database even if you dont have much experience with relational design. For example, you can use the Database Wizard to create ten predefined types of databases, from an Asset Tracking database to a Time and Billing database. Or, if you already have your data in a spreadsheet or table of some sort, but you have repeating data (unnormalized data) and you want to separate the data out into two or more relational Microsoft Access tables, you can use the Table Analyzer Wizard to help you decide which fields need to be moved to separate tables. If youre not satisfied with having Microsoft Access do the work for you, however, and you want to know more about relational database design, this document is for you. It shows you how to plan and to design a database from the ground up. For practical examples, it uses the database design of the Northwind Traders sample database included in the Microsoft Access package. The Database Design Process The key to understanding the database design process lies in understanding the way a relational database management system, such as Microsoft Access, stores data. To efficiently and accurately provide you with information, Microsoft Access needs to have the facts about different subjects stored in separate tables. For example, you might have one table that stores only facts about employees, and another that stores only facts about sales. When you use your data, you then combine and present facts in many different ways. For example, you may print reports that combine facts about employees and facts about sales.  When you design a database, you first break down the information you want to keep as separate subjects, and then you tell Microsoft Access how the subjects are related to each other so that Microsoft Access can bring the right information together when you need it. Steps in Designing a Database Here are the steps in the database design process. Each step is discussed in greater detail in the remaining sections of this paper. Step One: Determine the purpose of your database. This will help you decide which facts you want Microsoft Access to store. Step Two: Determine the tables you need. Once you have a clear purpose for your database, you can divide your information into separate subjects, such as Employees or Orders. Each subject will be a table in your database. Step Three: Determine the fields you need. Decide what information you want to keep in each table. Each category of information in a table is called a field and is displayed as a column in the table. For example, one field in an Employees table could be Last Name; another could be Hire Date. Step Four: Determine the relationships. Look at each table and decide how the data in one table is related to the data in other tables. Add fields to tables or create new tables to clarify the relationships, as necessary. Step Five: Refine your design. Analyze your design for errors. Create the tables and add a few records of sample data. See if you can get the results you want from your tables. Make adjustments to the design as needed. Dont worry if you make mistakes or leave things out of your initial design. Think of it as a rough draft that you can refine later. Experiment with sample data and prototypes of your forms and reports. With Microsoft Access, its easy to change the design of your database as youre creating it. However, it becomes much more difficult to make changes to tables after theyre filled with data and after youve built forms and reports. For this reason, make sure that you have a sound design before pushing too far ahead. Common Design Problems There are several common pitfalls you may encounter when designing your database. These problems can cause your data to be harder to use and maintain. The following are signs that you should reevaluate your database design: You have one table with a large number of fields that dont all relate to the same subject. For example, one table might contain fields pertaining to your customers as well as fields that contain sales information. Try to make sure each table contains data about only one subject. You have fields that are intentionally left blank in many records because they arent applicable to those records. This usually means that the fields belong in another table. You have a large number of tables, many of which contain the same fields. For example, you have separate tables for January sales and February sales, or for local customers and remote customers, in which you store the same type of information. Try consolidating all the information pertaining to a single subject in one table. You may also need to add an extra field, for example, to identify the sales date. Determining the Purpose The first step in designing a Microsoft Access database is to determine the purpose of the database and how its to be used. This tells you what information you want from the database. From that, you can determine what subjects you need to store facts about (the tables) and what facts you need to store about each subject (the fields in the tables). Talk to the people who will use the database. Brainstorm about the questions youd like the database to answer. Sketch out the reports youd like it to produce. Gather the forms you currently use to record your data. Youll use all this information in the remaining steps of the design process. Example: Tracking Sales and Inventory Suppose that Northwind Traders, an import/export company that sells specialty foods from around the world, wants a database that can track information about the companys sales and inventory. Start by writing down a list of questions the database should be able to answer. How many sales of our featured product did we make last month? Where do our best customers live? Whos the supplier for our best-selling product? Next, gather all the forms and reports that contain information the database should be able to produce. Northwind Traders currently uses a printed report to keep track of products being ordered and an order form to take new orders. The following illustration shows these two documents.  Northwind Traders also needs to print mailing labels for customers, employees, and suppliers. After gathering this information, youre ready for the next step. Determining the Tables You Need Determining the tables in your database can be the trickiest step in the database design process. Thats because the results you want from your databasethe reports you want to print, the forms you want to use, the questions you want answereddont necessarily provide clues about the structure of the tables that produce them. They tell you what you want to know, but not how to categorize the information into tables. See the preceding order form as an example. It includes facts about the customerthe customers address and phone numberalong with facts about the order. This form provides you with a number of facts that you know you want to store in your database. But youd run into problems if you stored the customer facts in the same table as the order facts: Introducing errors in duplicate information. Suppose that one customer places three different orders. You could add the customers address and phone number to your database three times, once for each order. But this multiplies the chance of data entry errors.  Also, if the customer moves, youd have to either accept contradictory information or find and change each of that customers sales records in the table. Its much better to create a Customers table that stores the customers address in your database once. Then if you need to change the data, you change it only once. Deleting valuable information. Suppose a new customer places an order and then cancels. When you delete the order from the table containing information on both customers and their orders, you would delete the customers name and address as well. But you want to keep this new customer in your database so you can send the customer your next catalog. Again, its better to put the information about the customer in a separate Customers table. That way you can delete the order without deleting customer information. Look at the information you want to get out of your database and divide it into fundamental subjects you want to track, such as customers, employees, products you sell, services you provide, and so on. Each of these subjects is a candidate for a separate table. Note: One strategy for dividing information into tables is to look at individual facts and determine what each fact is actually about. For example, on the Northwind Traders order form, the customer address isnt about the sale; its about the customer. This suggests that you need a separate table for customers. In the Products On Order report, the suppliers phone number isnt about the product in stock; its about the supplier. This suggests that you need a separate table for suppliers. Example: Designing Tables in the Northwind Database The Northwind Traders order form and Products On Order report include information about these subjects: Customers Suppliers Products Orders From this list, you can come up with a rough draft of the tables in the database and some of the fields for each table. Its a good idea as you start to design a database to write down the information you will need to have as you create your tables.  Although the finished Northwind database contains other tables, this list is a good start. Later in this paper, youll see how to add other tables to refine your design. Determining the Fields You Need To determine the fields in a table, decide what you need to know about the people, things, or events recorded in the table. You can think of fields as characteristics of the table. Each record (or row) in the table contains the same set of fields or characteristics. For example, an address field in a customer table contains customers addresses. Each record in the table contains data about one customer, and the address field contains the address for that customer. Tips for Determining Fields Here are a few tips for determining your fields: Relate each field directly to the subject of the table. A field that describes the subject of a different table belongs in the other table. Later, when you define relationships between your tables, youll see how you can combine the data from fields in multiple tables. For now, make sure that each field in a table directly describes the subject of the table. If you find yourself repeating the same information in several tables, its a clue that you have unnecessary fields in some of the tables. Dont include derived or calculated data. In most cases, you dont want to store the result of calculations in tables. Instead, you can have Microsoft Access perform the calculations when you want to see the result. For example, the Products On Order report shown earlier in this paper displays the subtotal of units on order for each category of product in the Northwind database. However, theres no Units On Order subtotal field in any Northwind table. Instead, the Products table includes a Units On Order field that stores the units on order for each individual product. Using that data, Microsoft Access calculates the subtotal each time you print the report. The subtotal itself doesnt need to be stored in a table. Include all the information you need. Its easy to overlook important information. Return to the information you gathered in the first step of the design process. Look at your paper forms and reports to make sure all the information you have required in the past is included in your Microsoft Access tables or can be derived from them. Think of the questions you will ask Microsoft Access. Can Microsoft Access find all the answers using the information in your tables? Store information in its smallest logical parts. You may be tempted to have a single field for full names, or for product names along with product descriptions. If you combine more than one kind of information in a field, its difficult to retrieve individual facts later. Try to break down information into logical parts; for example, create separate fields for first and last name, or for product name, category, and description. Example: Adding Fields to the Products Table Northwind Traders sells imported specialty foods from around the world. The employees use a Products On Order report to keep track of products being ordered.  The report indicates that the Products table, which contains facts about products sold, needs to include fields for the product name, units in stock, and units on order, among others. But what about fields for the supplier name and phone number? To produce the report, Microsoft Access needs to know which supplier goes with each product. One approach would be to include Supplier Name and Supplier Phone fields in the Products table, but this can cause more problems than it solves. Since Northwind Traders might buy many products from the same supplier, the name and phone number of the supplier would have to be repeated in the Products table many times. If the phone number ever changed, it would have to be changed many times as well.  Instead, create a Suppliers table, with separate fields for the suppliers name and phone number. In the next step, youll add a field to the Products table that identifies the supplier information you need. Primary Key Fields The power in a relational database management system such as Microsoft Access comes from its ability to quickly find and bring together information stored in separate tables. In order for Microsoft Access to work most efficiently, each table in your database should include a field or set of fields that uniquely identifies each individual record stored in the table. This is often a unique identification number, such as an employee ID number or a serial number. In database terminology, this information is called the primary key of the table. Microsoft Access uses primary key fields to quickly associate data from multiple tables and bring the data together for you. If you already have a unique identifier for a table, such as a set of product numbers youve developed to identify the items in your stock, you can use that identifier as the tables primary key. But make sure the values in this field will always be different for each recordMicrosoft Access doesnt allow duplicate values in a primary key field. For example, dont use peoples names as a primary key, because names arent unique. You could easily have two people with the same name in the same table. If you dont already have a unique identifier in mind for a table, you can use a field that simply numbers the records consecutively. Microsoft Access can even set up a primary key like that for you. For more information about Primary Keys, search for Primary Key in Microsoft Access Help. When choosing primary key fields, keep these points in mind: Microsoft Access doesnt allow duplicate or null values in a primary key field. For this reason, you shouldnt choose a primary key that could contain such values. You may use the value in the primary key field to look up records, so it shouldnt be too long to remember or type. You may want it to have a certain number of letters or digits, or be in a certain range. The size of the primary key affects the speed of operations in your database. When you create primary key fields, you can set a property to limit the size of the field. For best performance, use the smallest size that will accommodate the values you need to store in the field. For more information, search for field size in Microsoft Access Help. Example: Setting the Primary Key for the Products Table The primary key of the Northwind Products table contains product ID numbers. Because each product number identifies a different product, you dont want two products with the same number.  In some cases, you may want to use two or more fields that together provide the primary key of a table. For example, the Order Details table in the Northwind database uses two fields as its primary key: Order ID and Product ID. In the next step, youll see why. Determining the Relationships Now that youve divided your information into tables, you need a way to tell Microsoft Access how to bring it back together again in meaningful ways. For example, the following form includes information from several tables.  Microsoft Access is a relational database management system. That means you store related data in separate tables. Then you define relationships between the tables, and Microsoft Access uses the relationships to find associated information stored in your database. For example, suppose that you want to phone an employee with questions about a sale the employee made. Employee phone numbers are recorded in the Employees table; sales are recorded in the Orders table. When you tell Microsoft Access which sale youre interested in, Microsoft Access can look up the phone number based on the relationship between the two tables. It works because Employee ID, the primary key for the Employees table, is also a field in the Orders table. In database terminology, the Employee ID field in the Orders table is called a foreign key, because its a primary key from a different table.  Note If you open the Orders table in the sample Northwind database included with Microsoft Access in Datasheet view, youll notice that there is an Employees field but no Employee ID field. The Employees field is actually the Employee ID field, but the Caption property is set to Employee and properties have been set on the Lookup tab to display the employee names rather than the ID numbers. The illustration above uses the Employee ID field to make the association between the tables clear. Later illustrations in this document also show the ID fields for education purposes rather than the lookup text that appears in the Northwind database. To learn more about how lookup tables work, search for lookup table in Microsoft Access Help. So, to set up a relationship between two tablesTable A and Table Byou add one tables primary key to the other table, so that it appears in both tables. But how do you decide which tables primary key to use? To set up the relationship correctly, you must first determine the nature of the relationship. There are three types of relationships between tables: One-to-many relationships Many-to-many relationships One-to-one relationships The rest of this section presents an example of each type of relationship and explains how to design your tables so that Microsoft Access can associate the data correctly. Note This section explains how you determine the relationships between your tables and how you decide which fields belong in the tables to support those relationships. You use the Relationships window to create the relationships. For more information, search for Relationships window in Microsoft Access Help. Example: Creating a One-to-Many Relationship A one-to-many relationship is the most common type of relationship in a relational database. In a one-to-many relationship, a record in Table A can have more than one matching record in Table B, but a record in Table B has at most one matching record in Table A. For example, the Suppliers and Products tables in the Northwind database have a one-to-many relationship.  To set up the relationship, you add the field or fields that make up the primary key on the one side of the relationship to the table on the many side of the relationship. In this case, you would add the Supplier ID field from the Suppliers table to the Products table, because one supplier supplies many products. Microsoft Access uses the supplier ID number to locate the correct supplier for each product. Example: Creating a Many-to-Many Relationship In a many-to-many relationship, a record in Table A can have more than one matching record in Table B, and a record in Table B can have more than one matching record in Table A. This type of relationship requires changes in your database design before you can correctly specify the relationship to Microsoft Access. To detect many-to-many relationships between your tables, its important that you look at both directions of the relationship. For example, consider the relationship between orders and products in the Northwind Traders business. One order can include more than one product. So for each record in the Orders table, there can be many records in the Products table. But thats not the whole story. Each product can appear on many orders. So for each record in the Products table, there can be many records in the Orders table.  The subjects of the two tablesorders and productshave a many-to-many relationship. This presents a problem in database design. To understand the problem, imagine what would happen if you tried to set up the relationship between the two tables by adding the Product ID field to the Orders table. To have more than one product per order, you need more than one record in the Orders table per order. Youd be repeating order information over and over for each record that relates to a single orderan inefficient design that could lead to inaccurate data. You run into the same problem if you put the Order ID field in the Products tableyoud have more than one record in the Products table for each product. How do you solve this problem? The answer is to create a third table that breaks down the many-to-many relationship into two one-to-many relationships. You put the primary key from each of the two tables into the third table.  Each record in the Order Details table represents one line item on an order. The Order Details tables primary key consists of two fieldsthe foreign keys from the Orders and Products tables. The Order ID field alone doesnt work as the primary key for this table, because one order can have many line items. The Order ID is repeated for each line item on an order, so the field doesnt contain unique values. The Product ID field alone doesnt work either, because one product can appear on many different orders. But together the two fields always produce a unique value for each record. In the Northwind database, the Orders table and the Products table arent related to each other directly. Instead, they are related indirectly through the Order Details table. The many-to-many relationship between orders and products is represented in the database using two one-to-many relationships: The Orders and Order Detail tables have a one-to-many relationship. Each order can have more than one line item, but each line item is connected to only one order. The Products and Order Detail tables have a one-to-many relationship. Each product can have many line items associated with it, but each line item refers to only one product. Example: Creating a One-to-One Relationship In a one-to-one relationship, a record in Table A can have no more than one matching record in Table B, and a record in Table B can have no more than one matching record in Table A. This type of relationship is unusual and may call for some changes in your database design. One-to-one relationships between tables are unusual because in many cases, the information in the two tables can simply be combined into one table. For example, suppose you created a Ping-Pong Players table to track information about a Northwind Traders ping-pong fundraising event. Because the ping-pong players are all employees of Northwind Traders, this table has a one-to-one relationship with the Employees table in the Northwind database.  You could add all the fields from the Ping-Pong Players table to the Employees table. But the Ping-Pong Players table tracks a one-time event, and you wont need the information after the event is over. Additionally, not all employees play ping-pong, so if these fields were in the Employees table, they would be empty for many records. For these reasons, it makes sense to create a separate table. When you detect the need for a one-to-one relationship in your database, consider whether you can put the information together in one table. If you dont want to do that for some reason, heres how to set up the relationship: If the two tables have the same subject, you can probably set up the relationship by using the same primary key field in both tables. If the two tables have different subjects with different primary keys, choose one of the tables (either one) and put its primary key field in the other table as a foreign key. Refining the Design Once you have the tables, fields, and relationships you need, its time to study the design and detect any flaws that might remain. Create your tables, specify relationships between the tables, and enter a few records of data in each table. See if you can use the database to get the answers you want. Create rough drafts of your forms and reports and see if they show the data you expect. Look for unnecessary duplications of data and eliminate them. As you try out your initial database, you will probably discover room for improvement. Here are a few things to check for: Did you forget any fields? Is there information that you need that isnt included? If so, does it belong in the existing tables? If its information about something else, you may need to create another table. Did you choose a good primary key for each table? If you use it to search for specific records, is it easy to remember and type? Make sure that you wont need to enter a value in a primary key field that duplicates another value in the field. Are you repeatedly entering duplicate information in one of your tables? If so, you probably need to divide the table into two tables with a one-to-many relationship. Do you have tables with many fields, a limited number of records, and many empty fields in individual records? If so, think about redesigning the table so it has fewer fields and more records. Example: Refining the Products Table Each product in the Northwind Traders stock falls under a general category, such as Beverages, Condiments, or Seafood. The Products table could include a field that shows the category of each product.  Suppose that in examining and refining the database, Northwind Traders decides to store a description of the category along with its name. If you add a Category Description field to the Products table, you have to repeat each category description for each product that falls under the categorynot a good solution. A better solution is to make Categories a new subject for the database to track, with its own table and its own primary key. Then you can add the primary key from the Categories table to the Products table as a foreign key.  The Categories and Products tables have a one-to-many relationship: one category can have more than one product in it, but any individual product can belong to only one category. Resources For additional help with database design, please visit our  HYPERLINK "http://support.microsoft.com/support/access/content/reldesign.asp" Relational Database Design Center at the following Microsoft Web Site:  HYPERLINK "http://support.microsoft.com/support/access/content/reldesign.asp" http://support.microsoft.com/support/access/content/reldesign.asp >?MNWXst 789;STop1235VWrs+,-/NOjkjUmHnHu mHnHu5:j5:UY5><60IS @ \ Z^^^ p`]p^`ss)*FHIJS vkp  e$$i%j%k%g&l&&&))e-f-g-U00K2t2!5F56)7t9u9v9Z<[<G?j5CJUj~5CJUju5CJUj.U5CJU5CJj5CJU65 jU mH nH uj5:CJOJQJU5\mHnHu mHnHujUmHnHu<v2ZDC$Eƀv5& A!a!#c$i%j%l%&()++?,K,W,b,k,e-g-.1.0"0]Z"0S0I25688t9v9:Z<\<,=?=?AB7CCD FDFFGZG?R?DDFGGIII(I7LBLwLxLyLzL~LQQTTTTTUUUUXXYYa]b]j_r_2e3e4eUoVoWosqtquqnrorrrrrr s sYsZs[ssssjU0J[jU jU j>U jtU j]Uj;5CJUj5CJUjI5CJU5 jAUj5CJU jU5CJEH6<GGH&HIIJwLxLzLcOPPQ QQS1S8TTT]ZDC$EƀÊ5&TTBVpVWYY\a]c]_`a6bbbtc2e3eZDC$EƀÊ5&3e5efg.hhhxij3kllmgnnUoVoZDC$Eƀڊ5&VoXopsqtqvq)r3r ssssqoe hh]h`hDC$Eƀ5&ZDC$Eƀ5& sssssZ hh]h`h9 0 00 PP/ =!0"#$%h Dd.rGGP  C ,Atablesampb/tc nR}_}ʉ DFntc nR}_}ʉPNG  IHDRTlw:GsRGB@}0PLTEO&I pHYs  ~DATx흻҆ *}K0U;[QyeV V'7t7' YlcInTvUݨFUm7jQUۍnTvUݨFUm7jQU"L*] fA UFUm % ̣.Vz7})sߕ Pc_T:?Qf>&oJJkppGnLw]Ml|TT>Ή+9^2*5n]Jg=*]@qGgrCTuQ5*Pq (m]%S 'Le[@յ2 T}Q !TѠq̫L߿~K;F?xI3mJcV?/ш'9O۩sh|BU:;ͼ*KbzoL<{]e*I;wgC] hjSV2)uF}ʚl|[N4E?l߸c7nTvh9w{녊jSӘ5YQuЮ[*Pd'\QQƨՔ58a4IL#aT w l6DƝPEO2C5<,df^^UJ%*Q釳8 Q ]E GILi1ɭWS'+{ޅ9^qT3&OClECD2TF@U?h q)Knuf6YWT9ή TSy=*$E%jP09Fe-*G5ګ oz{#,~gAxucƈBJ'ZwA%<_1R;-vLlΨoC!YUpr|p>MՐ>Ӣs$?J҄*gFUW߄egtZTeU'2U*zfTǯ)kW8LkO?Nr?iK%ܨ;LjҨLJȠ~|6U,SfΩ5B[*숃UP) ՇҨ !^AEKmK%dP ZP Bl<KPI [aH,C$wgTܓ8 L?._0f wM4($wbuDSO$~~"bPEG=W3"*Y*JWjʢ2g 1! pcrP-(Ӊ2*EɄ.`mVzmȨ!բ0(5U.eZX|Ϋ ՚~5Q~U<4Aeա-6@.(-4%QaT ,%V} uA9.:P% s`7ըuP;p Ӟz FsTJ{˛0JJar Bդ,l*bsATgPV`D j6KO*DQJХ+_gP`#xMhH'-޶ ;P5zTWl)d.Ond.QT !u賡FHҗO.:"J}KA rx=t{z2hj=BS(:|ǻ"Qh[jW/&_b{ۍ p{Rg"!TR NE巀Jy'݄ {~yNT ]߬Qݨ*XT?K]ߣǫgd'vQU؍[G7!ՈkPncA;9ZΜU pt7:Tn(BbgyT jQ5 J?8s$9T ֫A{A.CTJM4)] ΙCEgO PM7@3XcAdPqo+{킊R}{#^q.ޱ \iUc,fO MMyTFU*&vT Z*n&a^Um7jQUZ UJm5UP4,*H(UUɣ{N*sz?uZ>x>'J??~sBܨbT\/?&8$U)OaO_yNsr *-Y荏C5!*A"^^WQYU l6gM:UL*R{gi h*ըUevLW#<̫ ?x^u4TӺjyo]djZ YoGh_eU_~q+٫uFUٯjWW}5PISWa謮FE<7T+0-kӫn}ꪟ>c[<:[b+ }P)-}> S}J1:F0ÿ7a>TPqHH/7Ta,lG5LZ+z GU@Jm:B5_բrJpUU`8#P XI"QatWCć;QagϚHɀ~/!y'TlHE0)T*P&Ƴp1U^_&A~lSAQkQDޥ#4@P/fWb0 PtרߝA*”x;*/1*O֨(~j,P ulGզʹ.,/R,ul8JZs<1v* 7dSE׀A8k$Wm~ XЫQ5YUSە~}> ls vcgx6yj13;{Bj@T^m'`0 ?'L&m1\UD%G&PU QŬ|RG{U4j.LBT\zJfa4?;zY*_סQ_Vv==M vbVr+Okj?f"B{@{ j*hU~ K/4[_L; l${RѹԂ%z֑0^%͈QU~zmrPU̼Si0\mޫW*F,*Eޣ ޺g^\P8FT(?+EO8IW-CIB%M[O -Q$Ts:=pW5FGWC'{UT*o=WW2zXP)@b3:vAqnQq !\ hcj~[2*j 'SR@qLjO:paT}Uh{ૠĩYFTVAl*U7*kIZ^UҫUf]+uyzFвhVsV%k{UO5학~5`O,L\{qTrB[.jۺ*PKQ&eC%'D$5jx"S[?8"H}{"B%"TPh,uҞ]?V(P%2> B@W=Պ0^EbPy'weJ CeENPd( 2UW͡s0N !('F(3$STnhuT 鶽*vqM5*v(:g\ (8Od *8;="H*[[(*mOzPKOdP֠RJVX1;mGCڠEa2 m x)T.+Y޺UVAPu+'Cuv {8N}KN$CQɤ M#UPPW%5xURD}@ttXFu W)HʒP5n 4Fq0vCq*(ΓXo4FJ%;A)FhΑp U- 'J]*VnsXwdTG%X+QiE7jPNme;PP%#kjAu #U/9*aQEEŨa! *e(OUΫu0T *I| ?;iGfTlwEfj@8)TQ***T'<%iGlw~ T@zҨ(^pdT#@URACT|yRSFS9Tn{@5yG!UHej *ݯTPBbZW`z @,½Ũ<Gh::,ضYeWSAZUP%S|'wϦk@+ xTw7jL9A3Ua*ذ^uUTްCeǂFS'*cAzcAS@r:T툪* RګJ*("%``$BTǂCUTA *;U4zf6cA|CUTAxSśiXvTU?WTVˆn3# f+ |JHY7ǂvCWy*T*@K]},h7TzKꧧnZpnj PŹ Պ9gkÜLuզ0W5aa3 P:׀ΈdvVUPX+{Fu^;͈> un3⻏퇪9#^ *:#XЎJ*yF6*8@y 1;*8jo2W6ZGK9*(6wSTP&]C hzګW^9 7*3AyױxHhI: FYuLDFef%1/ܠ!_DtRDTNK` "MGpW7MPFcZV ȣNd.yZ PcAkKcZmT+Qp *Da zSR @Ƃ{A]P]܄[S-#MS/;Hwл/ACڐ,>LK*+pOrvaTm^e5JVU*(Я*" o 4*fvxT]ިwyޥC+făզ2kCHMT w lꩪfN;8UrYl^|;TPy"̨fPUPˆe< P)<1SBT+fĿQh+*ƈew9$ HI;Nq';gě Qx SWJ*ZԄjuϋzTRxF"U3nBRըb)3WMTP#C= T*}T^h8#~zB%TDSU, \RU͈q8 P]84aP H?6ح(q^{ft??/{ؕ+=PӟFjWTc=L^5nji(؀Q hਗf`D^v9qHz~{#TKCG&-*4q P0HZ8US Q ɀ9AXj"#mjQ(<* ÇyP˼Q#ꪅ|]-PYT-jmm~PđUϫgREFnF"ǟsUGU8jU:  g2>-U[?T۫F?b7jQUۍnTK(h IENDB`[8Dd#%(E0  # Ab7|SKNՓڌ 87Fn7|SKNՓڌ 8PNG  IHDRXk\aqsRGBPLTExxxgggTUVDDD433$!"  !DP(Iugchapter&I`, :i+00GEntire Network&ACons-marketingMicrosoft NetworkB\\WpguserH<@A Ug0201b.bmpUG0201B.BM)I.$2m? 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