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Regular description for $\sigma(L)$ where $L=\{ w \in \{a,b,c\}^* \mid \exists x,y: ((w=xay\;\vee\;w=xcy)\;\wedge\;|y|=1) \}$
and $\sigma$ is the morphism defined by $\sigma(a)=aba$, $\sigma(b)=aa$ and $\sigma(c)=b$
Give a regular description for the image of the set of words over $\{a,b,c\}$,
with either an $a$ or a $c$ in the second position starting from the end, through the morphism
$\sigma$ defined by $\sigma(a)=aba$, $\sigma(b)=aa$ and $\sigma(c)=b$
Authors: Guillem Godoy
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