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AB∪BC∪AC A∪B∪C 
A∪（B∪
A∪B=B∪A∩B=B∩A A∪(B∪C)=(A∪B)∪C A ∩(B∩C)=(A∩B)∩C A∪(B∩C)=(A∪B)∩(A∪C) A∩(B∪C)=(A∩B)∪(A∩C) 
cup of coffee
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A∪B-B=A A∪B-B=A∪B (A-B)∪B=A (A-B)∪B=A∪B
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