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# lights out, see http://www.perlmonks.com/?node_id=940327 ... # try this for example: #lightout(14, 14, 7);
gap> lightout(14, 14, 7); Found a solution for (R=14, C=14, M=7) ... 1 1 . 1 1 . 1 . . 1 . . 1 1 . . . 1 1 . . gap>