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例子
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所有常规集合系统及其BII编号的序列开始于:
0: {}
1: {{1}}
2: {{2}}
3: {{1},{2}}
4: {{1,2}}
7: {{1},{2},{1,2}}
8: {{3}}
9: {{1},{3}}
10: {{2},{3}}
11: {{1},{2},{3}}
12: {{1,2},{3}}
16: {{1,3}}
18: {{2},{1,3}}
25: {{1},{3},{1,3}}
30: {{2},{1,2},{3},{1,3}}
32: {{2,3}}
33: {{1},{2,3}}
42: {{2},{3},{2,3}}
45: {{1},{1,2},{3},{2,3}}
51: {{1},{2},{1,3},{2,3}}
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