Question: Lemma 1 . Let G = ( N , T , P , S ) be a context free grammar. Let BinN and win (

Lemma 1. Let G=(N,T,P,S) be a context free grammar. Let BinN and win(NT)+. Then
there is a derivation tree for G with root B and border word w if and only if B**Gw.
Lemma 1. Let G=(N,T,P,S) be a context free grammar. Let BinN

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