Metro can be at a backdoor.Logical formLearned from4 sentences. A backdoor can be electronic.Logical formLearned from4 sentences. A worm may set_up a backdoor.Logical formLearned from4 sentences. A program can be a backdoor.Logical formLearned from4 sentences. A machine can be free from backdoors.Logical formLearned from4 sentences. Backdoors can be for eavesdropping.Logical formLearned from4 sentences. A backdoor can be a means of getting into a (computer system).Logical formLearned from4 sentences. Backdoors may be placed by a programmer.Logical formLearned from4 sentences. Some programs may have backdoors.Logical formLearned from4 sentences. A backdoor may be left open.Logical formLearned from4 sentences. Persons can be a backdoor.Logical formLearned from4 sentences. Backdoors may undergo an installation.Logical formLearned from3 sentences. A backdoor may work.Logical formLearned from3 sentences. (Hardware encryption) can be with a (government backdoor).Logical formLearned from3 sentences. A backdoor can be on computers.Logical formLearned from3 sentences.