Condition (1) ⇒ A * B = A is the father of B. So C * D = C is the father of D. C is father. Condition (2) ⇒ A% B = A is the daughter of B. Therefore D% E. = D is the daughter of E. E is mother. Condition (3) ⇒ A + B = A is the sister of B. So E + F. = E is the sister of F. Therefore, C is the husband of F (E)’s sister.