Lists of finite lattices (graded, n=21 elements, c=2 coatoms)
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List of vertically indecomposable graded lattices of 21 elements and 2 coatoms, in xz-compressed digraph6 format.

List of vertically indecomposable graded lattices of 21 elements and 2 coatoms, in xz-compressed digraph6 format.