Exercise 39:

Non-ambiguous CFG for the complement of {anbnn0}\{ a^n b^n \mid n\geq 0 \}
Write a non-ambiguous CFG generating the language of words over {a,b}\{a,b\} that are not of the form anbna^nb^n, where n0n\geq 0.
Authors: Guillem Godoy / Documentation:
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