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Observe that the type of [fold] is parameterized by _two_ type variables, [X] and [Y], and the parameter [f] is a binary operator that takes an [X] and a [Y] and returns a [Y]. Can you think of a situation where it would be useful for [X] and [Y] to be different

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Observe that the type of [fold] is parameterized by _two_ type variables, [X] and [Y], and the param...

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