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Solve the following problem using Python, implementing the functions described below, one line at a time
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<USER_TASK:>
Description:

def merge_config(self, user_config):
        '''
        Take a dictionary of user preferences and use them to update the default
        data, model, and conversation configurations.
        '''

        # provisioanlly update the default configurations with the user preferences
        temp_data_config = copy.deepcopy(self.data_config).update(user_config)
        temp_model_config = copy.deepcopy(self.model_config).update(user_config)
        temp_conversation_config = copy.deepcopy(self.conversation_config).update(user_config)

        # if the new configurations validate, apply them
        if validate_data_config(temp_data_config):
            self.data_config = temp_data_config
        if validate_model_config(temp_model_config):
            self.model_config = temp_model_config
        if validate_conversation_config(temp_conversation_config):
            self.conversation_config = temp_conversation_config