按要求写出以下结构的词语:
ABB: _________________ _________________ __________________ _________________
ABAB: _________________ _________________ __________________ _________________
ABCC: _________________ _________________ __________________ _________________
AABC: _________________ _________________ __________________ _________________
AABB: _________________ _________________ __________________ _________________
ABAC: _________________ _________________ __________________ _________________