, 27 .
. , , . , , . .
: ( ), (, ).
:
1) . 1 + , . .. 1 , 1 + 1 , - 1 + 2 ..
2) . , 6 . , .
1 + , + 2 , .
.. 1 + 2 - , : 1 + 1 + 2 - . .
.. .
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