Answer
aaaba is in the language but baabb is not a language
Work Step by Step
in the Expression: (b | E)a(a | b)∗a(b | E), strings: aaaba, baabb
aaaba is in the language but baabb is not because if a string in the language contains a b to the right of the leftmost a, then it must contain another a to the right of the all b’s.