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????????? ???????? ???????? ???? ???? ??? ???, ??? ?????? ?????? ??????? ?? ??????? ?????? ????? ?????? ??? ????? ?? ????? ????????, ????? ?????? ??????? ???????? ???? ???????????? ????? ??? ????? ^[?]

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↑ Kendall G.; Parkes A.; and Spoerer K. (2008) A Survey of NP-Complete Puzzles , International Computer Games Association Journal, 31(1), pp 13?34.

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van Delft, Pieter; Botermans, Jack (????)? Creative puzzles of the world ?

[1] Kendall G.; Parkes A.; and Spoerer K. (2008) A Survey of NP-Complete Puzzles , International Computer Games Association Journal, 31(1), pp 13?34.

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