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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 add_string_parameters(self, string):
 """Add given string parameters to the internal list. Args: string (list of str or str):
 A string or list of strings to add to the parameters. """

        if isinstance(string, list):
            for x in string:
                self.add_string_parameters(x)
            return
        self._parameters.append("{ \"value\": \"" + string + "\" }")