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Consider the Regular expression (a(cd)*b)* Find a string over {a, b, c, d}^4 which matches the expression. Find a string over {a, b, c, d}^4

Consider the Regular expression (a(cd)*b)*

Find a string over {a, b, c, d}^4 which matches the expression.

Find a string over {a, b, c, d}^4 which doesnt match the expression.

Find a string over {a, b} ^4 which matches the expression.

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