Question: There are six strings of length 4 which cannot be produced by the following regular expression over the alphabet = { a , b }

There are six strings of length 4 which cannot be produced by the following regular expression over the alphabet
={a,b}
. What are they? \[(b+a a)^{*}(a b+b a)(a+b b)^{*}\] EDIT: Originally the problem incorrectly stated seven strings. It should be six.

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