aaa aa b b b b b b e e ee e e e e
aa aa b b b ab b b e e ea e e e
aa a b b b aba ba e e ea e e ab ba
aa b b b aba(ba)*a e e ea abUaba(ba)* ba(ba)*a
aa b b b e e eaU abUaba(ba)*Uaba(ba)*aba(ba)*a
aa b b* (ab)* e a aU abUaba(ba)*Uaba(ba)*aba(ba)*a
b* (ab)* (aab)* e a aaUaUabUaba(ba)*Uaba(ba)*aba(ba)*a
(b* (ab)* (aab)*)* aUaaUaUabUaba(ba)*Uaba(ba)*aba(ba)*a