我自己的寫法是若出現A、B、C...三個以上的集合

請排成

A+B

A+C

A+D

B+C

B+D

C+D

A contain B

A does not contain C

A does not contain D

B does not contain A

B does not contain C

B contain D

C contain A

C contain B

C contain D

D does not contain A

D does not contain B

D contain C

我用這樣的順序寫是可以AC的