Question 91
in a word consisting of the letters $a$ şi $b$ Changes are possible $a b a \rightarrow b$, $b \rightarrow a b a$, $b b a \rightarrow a$, $a \rightarrow b b a$. . If we start from the word $\underbrace{a a \ldots a}_{2003} b$, it is possible to get the word $b \underbrace{a a \ldots a}_{2003}$ ?