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4.1 Suppose that we represent Sam is Bill's father by FA- THER BILL, SAM) and Harry is one of Bill's ancestors by ANCES- TOR(BILL, HARRY).

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4.1 Suppose that we represent "Sam is Bill's father" by FA- THER BILL, SAM) and "Harry is one of Bill's ancestors" by ANCES- TOR(BILL, HARRY). Write a wff to represent "Every ancestor of Bill is either his father, his mother, or one of their ancestors

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