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EXAMPLE
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The sequence of all set-systems with spanning edge-connectivity 2 together with their BII-numbers begins:
52: {{1,2},{1,3},{2,3}}
53: {{1},{1,2},{1,3},{2,3}}
54: {{2},{1,2},{1,3},{2,3}}
55: {{1},{2},{1,2},{1,3},{2,3}}
60: {{1,2},{3},{1,3},{2,3}}
61: {{1},{1,2},{3},{1,3},{2,3}}
62: {{2},{1,2},{3},{1,3},{2,3}}
63: {{1},{2},{1,2},{3},{1,3},{2,3}}
84: {{1,2},{1,3},{1,2,3}}
85: {{1},{1,2},{1,3},{1,2,3}}
86: {{2},{1,2},{1,3},{1,2,3}}
87: {{1},{2},{1,2},{1,3},{1,2,3}}
92: {{1,2},{3},{1,3},{1,2,3}}
93: {{1},{1,2},{3},{1,3},{1,2,3}}
94: {{2},{1,2},{3},{1,3},{1,2,3}}
95: {{1},{2},{1,2},{3},{1,3},{1,2,3}}
100: {{1,2},{2,3},{1,2,3}}
101: {{1},{1,2},{2,3},{1,2,3}}
102: {{2},{1,2},{2,3},{1,2,3}}
103: {{1},{2},{1,2},{2,3},{1,2,3}}
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