Write down the CFG that generates each of the following languages: (1) {w| length of w is even (at least 4) and its middle two symbols are different} (E = {a,b})

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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Problem 4
Write down the CFG that generates each of the following languages:
(1) {w| length of w is even (at least 4) and its middle two symbols are different} (E= {a,b})
Transcribed Image Text:Problem 4 Write down the CFG that generates each of the following languages: (1) {w| length of w is even (at least 4) and its middle two symbols are different} (E= {a,b})
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