Young's lattice is the infinite lattice of all partitions with partial ordering given by componentwise linear ordering.
If $n$ is specified, then the poset returned is the subposet of Young's lattice given by the induced subposet of all partitions of size at most $n$.
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If an upper partition, hi, is specified, then the returned poset is the closedInterval of the Young's lattice between lo and hi, where lo either is the empty partition or is specified.
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The object youngSubposet is a method function.