Place seven copies of the hexomino below in a 4x12 rectangle, with the condition that none of the six remaining squares touch each other orthogonally or diagonally.
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I don't know if there is more than one solution. Mine is identical to the official one.
Here's a hint: Of the six unused squares, exactly three are in corners, two others are edge squares.
Posted by Jer
on 2016-09-11 13:36:19