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.
. 12 . 7 ?
1. ?2. ?3. ?4. ?
! .
-1
12 7 12*7=84 .
(1, 1, 1, 1, 1, 1,..)- .
.
* =
.
8 . 2, 4, 6, 7, 9 .
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93- 2, 4, 5