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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 to_args(self):
 # type: () -> List[str] """ Return the VCS-specific command arguments. """

        args = []  # type: List[str]
        rev = self.arg_rev
        if rev is not None:
            args += self.vcs.get_base_rev_args(rev)
        args += self.extra_args

        return args