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( 1 5 pts . ) Show that L = { w | w = a 2 n b a n } is not regular,

(15

pts

.)

Show that

L = {w | w = a^{2 n} b a^{n}}

is not regular, where

= {a} .

L

context free? if it is a CFL

,

you need to provide

a CFG or a PDA.

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