The poset P is ranked if there exists an integer function r on the vertex set of P such that for each a and b in the poset if b covers a then r(b) - r(a) = 1.
i1 : rankFunction chain 5
o1 = {0, 1, 2, 3, 4}
o1 : List
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i2 : rankFunction booleanLattice 3
o2 = {0, 1, 1, 2, 1, 2, 2, 3}
o2 : List
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