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Q.
An individual token is called ________

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1.
Match the following
Group 1 Group 2P. Regular expression 1. Syntax analysis

Q. Pushdown automata 2. Code generation

R. Dataflow analysis 3. Lexical analysis

S. Register allocation 4. Code optimization
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2.
RE can be used only for values of type string and number.
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3.
?-transitions does not add any extra capacity of recognizing formal
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4.
The classes of languages P and NP are closed under certain operations, and not closed under others. Decide whether P and NP are closed under each of the following operations.
1. Union

2. Intersection

3. Intersection with a regular language

4. Kleene closure (star)

5. Homomorphism
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5. 
Which of the following languages is/are regular?
L1: {wxwR ? w, x ? {a, b}* and ?w?, ?x? >0} wR is the reverse of string w

L2: {anbm ?m ? n and m, n?0

L3: {apbqcr ? p, q, r ? 0}
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