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EXAMPLE
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Non-isomorphic representatives of the a(4) = 16 antichains are:
((1111)), ((1112)), ((1122)), ((1123)), ((1234)),
((1)(234)), ((2)(111)), ((2)(113)), ((11)(12)), ((11)(22)), ((11)(23)), ((12)(13)), ((12)(34)),
((1)(2)(34)),((2)(3)(11)),
((1)(2)(3)(4)).
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