a. Compose the substitution sets {a/X, Y/Z} and {X/W, b/Y}. b. Prove that composition of substitution sets

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a. Compose the substitution sets {a/X, Y/Z} and {X/W, b/Y}.

b. Prove that composition of substitution sets is associative.

c. Construct an example to show that composition is not commutative.

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