(Entryway operations) can be extraterrestrial.Logical formLearned from10 sentences. A floor can be extraterrestrial.Logical formLearned from10 sentences. A noose can be extraterrestrial.Logical formLearned from10 sentences. Observations can be extraterrestrial.Logical formLearned from10 sentences. An explanation can be extraterrestrial.Logical formLearned from10 sentences. Life-forms can be extraterrestrial.Logical formLearned from10 sentences. A virus can be extraterrestrial.Logical formLearned from10 sentences. A race can be constituted-of-or-filled-with extraterrestrial beings.Logical formLearned from9 sentences. An irradiance can be extraterrestrial.Logical formLearned from9 sentences. A superfluity can be extraterrestrial.Logical formLearned from9 sentences. A brother can be extraterrestrial.Logical formLearned from9 sentences. A disclosure can be extraterrestrial.Logical formLearned from9 sentences. A property can be extraterrestrial.Logical formLearned from9 sentences. Powers can be extraterrestrial.Logical formLearned from9 sentences. (Radio signals) can be from extraterrestrial civilizations.Logical formLearned from9 sentences.