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EXAMPLE
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Non-isomorphic representatives of the a(2) = 2 through a(4) = 20 multisystems:
{1,1} {{1},{1,1}} {{{1}},{{1},{1,1}}}
{1,2} {{1},{1,2}} {{{1,1}},{{1},{1}}}
{{1},{2,3}} {{{1}},{{1},{1,2}}}
{{2},{1,1}} {{{1,1}},{{1},{2}}}
{{{1}},{{1},{2,2}}}
{{{1,1}},{{2},{2}}}
{{{1}},{{1},{2,3}}}
{{{1,1}},{{2},{3}}}
{{{1}},{{2},{1,1}}}
{{{1,2}},{{1},{1}}}
{{{1}},{{2},{1,2}}}
{{{1,2}},{{1},{2}}}
{{{1}},{{2},{1,3}}}
{{{1,2}},{{1},{3}}}
{{{1}},{{2},{3,4}}}
{{{1,2}},{{3},{4}}}
{{{2}},{{1},{1,1}}}
{{{2}},{{1},{1,3}}}
{{{2}},{{3},{1,1}}}
{{{2,3}},{{1},{1}}}
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