Stairs may pertain-to a club.Logical formLearned from3 sentences. A robot may climb stairs.Logical formLearned from3 sentences. A footfall can be on stairs.Logical formLearned from3 sentences. Stairs may have rails.Logical formLearned from3 sentences. Stairs may be cuted into cliffs.Logical formLearned from3 sentences. Stairs can be smoke-filled.Logical formLearned from3 sentences. Passengers may climb some stairs to an aircraft.Logical formLearned from3 sentences. A male may emerge at a top of stairs.Logical formLearned from3 sentences. Men may charge_up stairs.Logical formLearned from3 sentences. Stairs can be in pajamas.Logical formLearned from3 sentences. Stairs can be in a city.Logical formLearned from3 sentences. (Deck stairs) may pertain-to a person.Logical formLearned from3 sentences. Stairs can be a pain.Logical formLearned from3 sentences. Some sets can be constituted-of-or-filled-with (fire stairs).Logical formLearned from3 sentences. Stairs can be decrepit.Logical formLearned from3 sentences.