Abstract
A polyomino contour can be represented as a word over a four letter alphabet A. Each letter induces a unit line pointing one of the four directions (right, left, up and down). According to[b], checking whether a rational language R⊂A* contains a polyomino contour word is undecidable. We restrict the problem to convex polyominoes and we prove that, in this case, the problem turns out to be decidable.
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