+--+ +--+ +--+--+ | | | | | | | +--+--+--+ +--+--+--+--+ | | | | | | | | +--+--+--+ +--+--+--+Take eight copies of one pentomino and place them on a 4x5 rectangle such that each 1x1 subsquare of the rectangle has exactly two pentominos covering it.
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perplexus dot info |
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