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80.

, ,

, . , 4- X , 4- 2 3 4-. [. (79.6)] . . , :

(79.3):

:

. 80.1

1 . , , .

(80.3) , . , . . , (. 6.2), (80.3). , , (80.3),

,

(80.3) , ,

, (80.3) :

,

(80.4) (80.6) , , (67.20),

, , (. 80.1).

(. )

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