def clear(self):
        self.maps[0].clear()
L{SSHPublicKeyDatabase.checkKey} should retrieve the content of the
dataset/ETHPy150Open ionelmc/python-aspectlib/src/aspectlib/py2chainmap.py/ChainMap.clear--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/conch/test/test_checkers.py/SSHPublicKeyDatabaseTestCase.test_checkKey2