, . -.
: . . = () (); . = (); /. = ; ./ =
. . = () (); . = (); /. = ; ./ =
. , , . . , , .
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2 . . .
1- : 6 ./ 2- . . , /. ./.
2- : 2 ./ ./, /. ./. 12 .
3- : 1 ./ ./, /. ./. -.
4- : (1 ./, 1 ./) 6 , /. ./, 6 . .
, 4- . , , .