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1. Use Pumping Lemma to show that the following languages over {a, b} are not regular. a) L1 = {x | n_a (x) = n_b
1. Use Pumping Lemma to show that the following languages over {a, b} are not regular.
a) L1 = {x | n_a (x) = n_b (x)}
b) L2 = {xx | x {a,b} ^* }
c) L3 = {xx^R | x {a,b} ^* }
d) L4 = {a^n b^m | n < m}
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