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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 tag_syntax_vislcg3(self):
 """ Changes default syntactic parser to VISLCG3Parser, performs syntactic analysis, and stores the results in the layer named LAYER_VISLCG3."""

        if not self.__syntactic_parser or not isinstance(self.__syntactic_parser, VISLCG3Parser):
            self.__syntactic_parser = VISLCG3Parser()
        return self.tag_syntax()