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7.

, ( 1), ( 2), ( 3)

, , ( 1, ) , [ ( 1, -) ( 1, ) ] , ( 1, )

, ( 4, ) ( 4, , )

( 5, ) ( 5, )

, ,

-

1) , , ,

2) ,

( )

( )

. 6.

3) ;

4) , ; , .

- , .

- .

, - , . 1.

, , ; (. 6, ), (. 6, ) (. 6, ), (. 6, ), (. 6, ).

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