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Exercise 1 For any string w = w1w2.. .wn the reverse of w, written wR, s the string u, in reverse order, wn. .. wzwi.

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Exercise 1 For any string w = w1w2.. .wn the reverse of w, written wR, s the string u, in reverse order, wn. .. wzwi. For any language A, let AR - \wR | wEA . Show that the set of context free languages is closed underR, i.e., if L is a context-free language, then so is LR

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