4. Prove by pumping lemma that $L_2$ is not regular where $L_2 = \{a^l b^m c^n \mid l < m \text{ or } m > n \}; l, m, n \ge 1\}$
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To prove that something is irregular, we need to show that it does not follow a regular pattern or does not conform to a set of rules or norms. Show more…
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