3. Forma Let us consider the following Context Free Grammar G = ({S, A, B, C, D, E}, {a,b,c}, S, P) with production rules P SaEblaaC|AA A → BC|bs|b B → aBle C → Ca Cb D → alc Manipulate the grammar G to transform it into the Chomsky Normal Form. More specifically 1. Remove, if possible, the null productions. Apply the appropriate algorithms, show and comment on, all the steps. 2. Remove, if possible, the unit productions. Apply the appropriate algorithms, show and comment on, all the steps. 3. Remove, if possible, the mixed terminal-non-terminal strings (productions), the strings (productions) with more than two non-terminal symbols, productions with starting sym- bols on the right hand side of the production rules. Apply the appropriate algorithms, show and comment on, all the steps. List at the end all the production rules the resulting grammar (in the Chomsky Normal Form).

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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QUESTION 3
3. Formal Grammars
Let us consider the following Context Free Grammar
G = ({S, A, B, C, D, E}, {a,b,c},S,P)
with production rules P
S → aEb|aaC|AA
A → BC|bs|b
B → aB €
C → CalCb
D → alc
Manipulate the grammar G to transform it into the Chomsky Normal Form. More specifically
1. Remove, if possible, the null productions. Apply the appropriate algorithms, show and
comment on, all the steps.
2. Remove, if possible, the unit productions. Apply the appropriate algorithms, show and
comment on, all the steps.
3. Remove, if possible, the mixed terminal-non-terminal strings (productions), the strings
(productions) with more than two non-terminal symbols, productions with starting sym-
bols on the right hand side of the production rules. Apply the appropriate algorithms, show
and comment on, all the steps. List at the end all the production rules of the resulting
grammar (in the Chomsky Normal Form).
Reduce, if possible, this resulting grammar (already in the Chomsky Normal Form). More
specifically,
4. Remove, if possible, the unproductive variables. Apply the appropriate algorithms, show
and comment on, all the steps. List at the end the production rules of the resulting
grammar.
5. Remove, if possible, the unreachable symbols. Apply the appropriate algorithms, show
and comment on, all the steps. List at the end the production rules of the resulting
grammar.
Transcribed Image Text:QUESTION 3 3. Formal Grammars Let us consider the following Context Free Grammar G = ({S, A, B, C, D, E}, {a,b,c},S,P) with production rules P S → aEb|aaC|AA A → BC|bs|b B → aB € C → CalCb D → alc Manipulate the grammar G to transform it into the Chomsky Normal Form. More specifically 1. Remove, if possible, the null productions. Apply the appropriate algorithms, show and comment on, all the steps. 2. Remove, if possible, the unit productions. Apply the appropriate algorithms, show and comment on, all the steps. 3. Remove, if possible, the mixed terminal-non-terminal strings (productions), the strings (productions) with more than two non-terminal symbols, productions with starting sym- bols on the right hand side of the production rules. Apply the appropriate algorithms, show and comment on, all the steps. List at the end all the production rules of the resulting grammar (in the Chomsky Normal Form). Reduce, if possible, this resulting grammar (already in the Chomsky Normal Form). More specifically, 4. Remove, if possible, the unproductive variables. Apply the appropriate algorithms, show and comment on, all the steps. List at the end the production rules of the resulting grammar. 5. Remove, if possible, the unreachable symbols. Apply the appropriate algorithms, show and comment on, all the steps. List at the end the production rules of the resulting grammar.
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QUESTION 3
3. Formal Grammars
Let us consider the following Context Free Grammar
G = ({S, A, B, C, D, E}, {a,b,c},S,P)
with production rules P
S → aEb|aaC|AA
A → BC|bs|b
B → aB €
C → CalCb
D → alc
Manipulate the grammar G to transform it into the Chomsky Normal Form. More specifically
1. Remove, if possible, the null productions. Apply the appropriate algorithms, show and
comment on, all the steps.
2. Remove, if possible, the unit productions. Apply the appropriate algorithms, show and
comment on, all the steps.
3. Remove, if possible, the mixed terminal-non-terminal strings (productions), the strings
(productions) with more than two non-terminal symbols, productions with starting sym-
bols on the right hand side of the production rules. Apply the appropriate algorithms, show
and comment on, all the steps. List at the end all the production rules of the resulting
grammar (in the Chomsky Normal Form).
Reduce, if possible, this resulting grammar (already in the Chomsky Normal Form). More
specifically,
4. Remove, if possible, the unproductive variables. Apply the appropriate algorithms, show
and comment on, all the steps. List at the end the production rules of the resulting
grammar.
5. Remove, if possible, the unreachable symbols. Apply the appropriate algorithms, show
and comment on, all the steps. List at the end the production rules of the resulting
grammar.
Transcribed Image Text:QUESTION 3 3. Formal Grammars Let us consider the following Context Free Grammar G = ({S, A, B, C, D, E}, {a,b,c},S,P) with production rules P S → aEb|aaC|AA A → BC|bs|b B → aB € C → CalCb D → alc Manipulate the grammar G to transform it into the Chomsky Normal Form. More specifically 1. Remove, if possible, the null productions. Apply the appropriate algorithms, show and comment on, all the steps. 2. Remove, if possible, the unit productions. Apply the appropriate algorithms, show and comment on, all the steps. 3. Remove, if possible, the mixed terminal-non-terminal strings (productions), the strings (productions) with more than two non-terminal symbols, productions with starting sym- bols on the right hand side of the production rules. Apply the appropriate algorithms, show and comment on, all the steps. List at the end all the production rules of the resulting grammar (in the Chomsky Normal Form). Reduce, if possible, this resulting grammar (already in the Chomsky Normal Form). More specifically, 4. Remove, if possible, the unproductive variables. Apply the appropriate algorithms, show and comment on, all the steps. List at the end the production rules of the resulting grammar. 5. Remove, if possible, the unreachable symbols. Apply the appropriate algorithms, show and comment on, all the steps. List at the end the production rules of the resulting grammar.
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