<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _detect(self):
 """ Detect uninitialized state variables Recursively visit the calls Returns: dict: [contract name] = set(state variable uninitialized) """

        results = []
        for c in self.slither.contracts_derived:
            ret = self.detect_uninitialized(c)
            for variable, functions in ret:
                info = "{}.{} ({}) is never initialized. It is used in:\n"
                info = info.format(variable.contract.name,
                                   variable.name,
                                   variable.source_mapping_str)
                for f in functions:
                    info += "\t- {} ({})\n".format(f.name, f.source_mapping_str)

                source = [variable.source_mapping]
                source += [f.source_mapping for f in functions]

                json = self.generate_json_result(info)
                self.add_variable_to_json(variable, json)
                self.add_functions_to_json(functions, json)
                results.append(json)

        return results