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The context free grammar S ? SS | 0S1 | 1S0 | ? generates

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1.
The language accepted by this DFA is ---

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2.
Which of the following language(s) generates more than one parse tree for a string ?

L1 = {a^nb^mc^md^n ? {a, b, c, d}* | n, m ? 0} 
      ? {a^nb^nc^md^m ? {a, b, c, d}* | n, m ? 0} 

L2 = {a^nb^mc^m ? {a, b, c}* | n, m ? 0} 
      ? {a^nb^nc^m ? {a, b, c}* | n, m ? 0}

L3 = {a^nb^mc^p ? {a, b, c}* | n ? m; n, m ? 0} 
      ? {a^nb^mc^p ? {a, b, c}* | m ? p; n, m ? 0}
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3.
The context free grammar S ? SS | 0S1 | 1S0 | ? generates _________
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4.
A CFG(Context Free Grammar) is said to be in Chomsky Normal Form (CNF), if all the productions are of the form A -> BC or A -> a. Let G be a CFG in CNF. To derive a string of terminals of length x, the number of products to be used is
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5.
Push down automata accepts which language
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