Question: a. The regular expression (b + ab)(a + ab) describes the set of all strings in {a, b} not containing the substring x for any

a. The regular expression (b + ab)(a + ab) describes the set of all strings in {a, b} not containing the substring x for any x. (Fill in the blanks appropriately.)

b. The regular expression (a + b)(aabbaa + bbaabb) (a + b) describes the set of all strings in {a, b} containing both the substrings ___and____ . (Fill in the blanks appropriately.)

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