Question: how that the context - free languages are closed under subsequence. ( When w = w 1 wn in Sigma , subseq ( w

how that the context-free languages are closed under subsequence. (When w = w1 wn in
\Sigma , subseq(w)={wi1 wi : 0<=<= n and 1<= i1< i2<< i<= n}; and subseq(L)=S
w in L subseq(w)). For example, subseq({0n1n : n >=0})=01.

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