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! Exercise 1 0 . 1 . 5 : Suppose we have an encoding of context - free grammars us - ing some finite alphabet.
Exercise : Suppose we have an encoding of contextfree grammars us
ing some finite alphabet. Consider the following two languages:
is a coded CFG A and are coded variables of
and the sets of terminal strings derived from A and are the same
and are coded CFGs and :
Answer the following:
a Show that is polynomialtime reducible to
b Show that is polynomialtime reducible to
c What do a and b say about whether or not and are NP
complete?
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