. .1.1 . , . , *.
, . ( ) ( ). 1 : (, ) , (, , ) (B2, PP, C) - .
( ), , (. _), ( ), ( ) ( ).
. , .
, , ( ) ( ) . , 12 ( ) 350 7 (), 35 13 (), 5 3 () 5 16 ().
- ( _ ). , , . , , (. ). . ( , 1 4.1 , 1 - 9.3 .)
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| _
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| 429.84
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| 274.61
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| 97.46
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| 46.30
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| 189.92
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| 96.14
|
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| 166.50
| |
. 1.1.
, - . ( ) ( _) ( ). ( ) ( , 2). , , .
, . ( ), , , .
, , ( _) . , , .
, ( ) . :
- , ;
- , .. 1, 2,..., n. , . , , , , , ( [2]);
- ( );
- (, "" , , , );
- , (NULL-), .. ;
- , ;
- .
, , ? , - relation - , . , , , , .
. 1968 .. IBM, , .
, , . , "", , , ( ) ( ), , .. " n" "", . [2,3] , :