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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 _verify_config_dict(self, valid, config, dev_os, key_path=None):
        '''
        Verify if the config dict is valid.
        '''
        if not key_path:
            key_path = []
        for key, value in valid.items():
            self._verify_config_key(key, value, valid, config, dev_os, key_path)