Is the Following Code Uniquely Decodable $\begin{aligned}1 & \mapsto a \\2 & \mapsto a b a \\3 & \mapsto b a b\end{aligned}$

Essay

Is the following code uniquely decodable?
$\begin{aligned}1 & \mapsto a \\2 & \mapsto a b a \\3 & \mapsto b a b\end{aligned}$