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2.9.

2.4 ( ) . .

RA, RB , . 2.43, .

CD , D AD CD, D , AD D . , . 2.43, .

. 2.43

, AD, , . D, . DC D

. . , DC (. 2.43, ). , RA DC .

. 2.44

RA . 2.43, . . 2.43,

, . 2.44, .

. 2.45

I , 2, I 1. ,

2, , , 1 3 . , 2, 1 3, 1 (. 2.44, ).

. 2.46

II, 25 610, , , . 2.44, RA RB , . 56 . ; , . 12 1011, , 2 10, .

1 11 , . , .

, , 12 1011 1 b b (. 2.44, ).

. 2.47

, . 2.45, 2.46 2.47.

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