Prove that if : S S' is an isomorphism of (S, *) with (S', *')

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Prove that if ∅ : S → S' is an isomorphism of (S, *) with (S', *') and Ψ : S'→ S11 is an isomorphism of (S', *') with (S", *"), then the composite function 1/J o ¢ is an isomorphism of (S, *) with (S", *").

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