Lib.Ru: : /.

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: [] [] [] [] [] []
[ ] [ ] : [] [] [][]
..1 .1 .1 . / 1 1 1 ----------.1 .*. ()1 2 - ..1 . 1 .1 1 1 1 (. 1 .1 2 1 -1 1 1 1 -1 1

: .