A signal can be alert.Logical formLearned from75 sentences. A signal can be digital.Logical formLearned from75 sentences. A statement can be a signal.Logical formLearned from75 sentences. Officials may send signals.Logical formLearned from75 sentences. A signal can be measured.Logical formLearned from74 sentences. A person may send a signal.Logical formLearned from74 sentences. Signals may travel.Logical formLearned from74 sentences. An announcement can be a signal.Logical formLearned from74 sentences. A signal can be combined.Logical formLearned from73 sentences. A system can be constituted-of-or-filled-with signals.Logical formLearned from73 sentences. A portion may pertain-to a signal.Logical formLearned from73 sentences. Signals can be from satellites.Logical formLearned from73 sentences. Signals can be from a US-city.Logical formLearned from73 sentences. A signal can be automatic.Logical formLearned from73 sentences. Signals may be received.Logical formLearned from73 sentences.