as u r saying l, m does not depend upon n and k but in the given condition it is mentioned dat.. m=l, m, n, k so all of them should accept equal no. of l,m, n and k..!!

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@ krati litoriya m=l, m,n,k,l >=1, it means m equals to l and value of m, n, k, l is greater than or equal to 1. Nowhere its written all m,l,n,k should be equal.

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**L1 = {0 ^{n+m}1^{k+l} | m = l, m, n, k, l >=1}**

We can write it as

L1 = {0

L1 = {0

**L2 = {0 ^{n}(11)^{m} | m,n >=0}**

Any number of zeros followed by even number of 1's, its regular.

According to me option D is correct, both L1 and L2 are regular.