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PDA translating $a^{m+n} b^n$ to $x^{2m+2} y^{3n}$

On my compilation theory exam we had the following problem: Construct a PDA translator (just one stack) such that it translates the language $$ a^{m+n}b^n \rightarrow x^{2m+2}y^{3n}, \text{ where } n, …
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