I'm currently trying to figure out whether this language is context-free using the pumping lemma.
$\qquad L = \{ v_1 v_2 v_1 v_2 \mid v_1 \in \{a, b\}^*, v_2 \in \{a, c\}^* \}$
I'm having trouble because I don't know how to use the bound $m > 0$.
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