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2.7.

2.6.

( ) , . , , X, , :

, X,

2.5.4

, X,

X, , , . .

, . 2.5.4

(2.17), (2.19), (2.21), (2.22)

, , :

(2.18), (2.20) (2.22) ,

2.2. ( 2.1). , : Y, , , [Rubin (1976)], . 2.1 , 1 2. 2.1 - , 3. X 1 2 , ,

2.1,

1, . , , . , ,

, 2.1 (7,8549, 7,9206), . (2.23) X:

(2.24) ,

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