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例子
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a（6）=1到a（8）=12个多集分区的非同构代表：
6: {{1,2},{1,3},{2,3}}
7: {{1,2},{1,3},{2,3,3}}
{{1,3},{1,4},{2,3,4}}
8: {{1,2},{1,3},{2,2,3,3}}
{{1,2},{1,3},{2,3,3,3}}
{{1,2},{1,3},{2,3,4,4}}
{{1,2},{1,3,3},{2,3,3}}
{{1,2},{1,3,4},{2,3,4}}
{{1,3},{1,4},{2,3,4,4}}
{{1,3},{1,1,2},{2,3,3}}
{{1,3},{1,2,2},{2,3,3}}
{{1,4},{1,5},{2,3,4,5}}
｛｛2,3｝、｛1,2,4｝、｛3,4,4｝
{{2,4},{1,2,3},{3,4,4}}
{{2,4},{1,2,5},{3,4,5}}
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