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Oz Programming. Give a functional definition of {MemberTwice Xs Y} that tests whether Y is an...

Oz Programming.

Give a functional definition of {MemberTwice Xs Y} that tests whether Y is an element that occurs at least 2 times in Xs. For example, the call {MemberTwice [a b c d b e] b} should return true, whereas {MemberTwice [a b c] b} should return false.

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