Question: 5. The recursive definition given below defines a set S of strings over the alphabet {a, by: Basis: a ES Recursive rule: If x E

5. The recursive definition given below defines a set S of

5. The recursive definition given below defines a set S of strings over the alphabet {a, by: Basis: a ES Recursive rule: If x E S, then bz E S, and az ? s. List all the strings of length at most 4 in S

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