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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def outputAlphabet(self):
 """ The full set of symbols which can be produced by this automaton. """

        return set(
            chain.from_iterable(
                outputSymbols for
                (inState, inputSymbol, outState, outputSymbols)
                in self._transitions
            )
        )