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GATE CSE & IT · Regular Languages · 1991-1991

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Hopcroft-Ullman / Dragon Book

Automata, languages, parsing, syntax-directed translation

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1991 PYQ

Let $$r = 1\,{\left( {1 + 0} \right)^ * },s = {11^ * }\,0$$ and $$\,t = {1^ * }\,0$$ be three regular expressions. Which one of the following is true?

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