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A set of constraints visualized as a sparse alignment. In each species, positions increase from left to right with respect to the partial order. Sequence positions in the same column are equal under the partial order. A set of xk, yk separations breaks the sparse alignment into a set of blocks. Positions xk-1, yk-1 and xk, yk define block k, which is composed of the core k (light gray) and the adjacent separation (dark gray).
