Question: Let Sigma = { 0 , : } and let L = { w | w = x _ 1 : x _ 2

Let \Sigma ={0, :} and let L ={w|w = x_1 : x_2 : : x_k for k >0, and each
x_i in 0, and x_i /= x_j for i /= j}
Prove that L is not regular using the pumping lemma

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