Hamilton-圈
G 1
G 2
G 3
G 6
G 7
完美匹配的交
M 4 ∩ M 5 = ∅
M 3 ∩ M 5 = ∅
M 2 ∩ M 5 = ∅
M 4 ∩ M 7 = ∅
M 4 ∩ M 6 = ∅
完美匹配的不交并
M 4 ∪ ˙ M 5
M 3 ∪ ˙ M 5
M 2 ∪ ˙ M 5
M 4 ∪ ˙ M 7
M 4 ∪ ˙ M 6