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18.4.2.

. . . 18.27 . . 17.14.

. 17.6.1 , .

, .

.

. 18.27. .

. 18.28. .

. 17.6.3 .

. 18.27 . (. 18.28). . 17.2.3, . .

. 11.8.1, , . , (. 18.29).

, . 18.28. .

, , , ,

. 18.29.

. 18.30. .

. , . 18.30 [18.2].

. (18.15)

; 20 80%.

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