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I came across this question in Peter-Linz today, Is the language L= { a^nb^n : n>=1 } U {b} deterministic ?

My doubt is that say we have a case like this {a^5 b^6} U {b}, after popping 5 a's from the stack for 5 b's how do we know that whether the last b is of {a^5 b^6} or {b}? So is it deterministic or non-deterministic?

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    $\begingroup$ You are reading set union wrong. $\endgroup$ – Raphael Jul 13 at 10:58

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