% hypergraph for which classical imbalance definition is problematic
% source: [YaIm13]
11 20
1 2
1 2
3 4 5 6 7 8 9
3 4 5 6 7 8 9
10 11 12 13 14
10 11 12 13 14
15 16 17 18 19 20
15 16 17 18 19 20
9 17
12 15
14 18