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Figure 1: (a) a polyomino; (b) a column convex polyomino which is not row convex; (c) aconvex polyomino.
Figure 2: (a) A directed convex polyomino; (b) a parallelogram polyomino.
Figure 3: A permutomino and the two associated permutations.
Figure 4: Two permutations π1 and π2 of Sn, satisfying 1 and 2, do not necessarily definea permutomino, since two problems may occur: (a) two disconnected sets of cells; (b) theboundary crosses itself.
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