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EXAMPLE
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Non-isomorphic representatives of the a(3) = 7 multisystems:
{1,1,1}
{1,1,2}
{1,2,3}
{{1},{1,1}}
{{1},{1,2}}
{{1},{2,3}}
{{2},{1,1}}
Non-isomorphic representatives of the a(4) = 48 multisystems:
{1,1,1,1} {{1},{1,1,1}} {{{1}},{{1},{1,1}}}
{1,1,1,2} {{1,1},{1,1}} {{{1,1}},{{1},{1}}}
{1,1,2,2} {{1},{1,1,2}} {{{1}},{{1},{1,2}}}
{1,1,2,3} {{1,1},{1,2}} {{{1,1}},{{1},{2}}}
{1,2,3,4} {{1},{1,2,2}} {{{1}},{{1},{2,2}}}
{{1,1},{2,2}} {{{1,1}},{{2},{2}}}
{{1},{1,2,3}} {{{1}},{{1},{2,3}}}
{{1,1},{2,3}} {{{1,1}},{{2},{3}}}
{{1,2},{1,2}} {{{1}},{{2},{1,1}}}
{{1,2},{1,3}} {{{1,2}},{{1},{1}}}
{{1},{2,3,4}} {{{1}},{{2},{1,2}}}
{{1,2},{3,4}} {{{1,2}},{{1},{2}}}
{{2},{1,1,1}} {{{1}},{{2},{1,3}}}
{{2},{1,1,3}} {{{1,2}},{{1},{3}}}
{{1},{1},{1,1}} {{{1}},{{2},{3,4}}}
{{1},{1},{1,2}} {{{1,2}},{{3},{4}}}
{{1},{1},{2,2}} {{{2}},{{1},{1,1}}}
{{1},{1},{2,3}} {{{2}},{{1},{1,3}}}
{{1},{2},{1,1}} {{{2}},{{3},{1,1}}}
{{1},{2},{1,2}} {{{2,3}},{{1},{1}}}
{{1},{2},{1,3}}
{{1},{2},{3,4}}
{{2},{3},{1,1}}
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