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= {w ∈ {a, b}* | at least one prefix of w contains strictly more b’s than a’s.}. For example, baa, abb, abbbaa are in L, but aab, aabbab are not in L. a) Construct a PDA that accepts L by final state. b) Construct a PDA that accepts L by empty stack.

= {w ∈ {a, b}* | at least one prefix of w contains strictly more b’s than a’s.}. For example, baa, abb, abbbaa are in L, but aab, aabbab are not in L. a) Construct a PDA that accepts L by final state. b) Construct a PDA that accepts L by empty stack.

Database System Concepts
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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L = {w ∈ {a, b}* | at least one prefix of w contains strictly more b’s than a’s.}.
For example, baa, abb, abbbaa are in L, but aab, aabbab are not in L.
a) Construct a PDA that accepts L by final state.
b) Construct a PDA that accepts L by empty stack.

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