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$\left \{ \left ( b^{n}ab^{n}a\right )^{m} | n,m \geq 0 \right \}$

$\left \{ \left ( b^{n}ab^{n}a\right )^{m} | n,m \geq 0 \right \} \cup \left \{ b^{n} | n\geq 0 \right \}$

$\left \{ \left ( b^{n}ab^{n}\right )^{m}a | n,m \geq 0 \right \}$

$NONE$

 

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