Persons may step_up stairs of a bus.Logical formLearned from2 sentences. Risers may pertain-to stairs.Logical formLearned from2 sentences. Stairs may lead to a dugout.Logical formLearned from2 sentences. Stairs may stand.Logical formLearned from2 sentences. A 6-year-old may bound_up stairs to a bedroom.Logical formLearned from2 sentences. Stairs may wound_up in a bay.Logical formLearned from2 sentences. A male may walk_up some flights of stairs.Logical formLearned from2 sentences. Stairs can be unlighted.Logical formLearned from2 sentences. Persons may rush (station stairs).Logical formLearned from2 sentences. A figure may climb stairs.Logical formLearned from2 sentences. A male may bound stairs.Logical formLearned from2 sentences. Steps can be on stairs.Logical formLearned from2 sentences. A suspect may run_down stairs.Logical formLearned from2 sentences. Stairs can be visible through windows of a building.Logical formLearned from2 sentences. Stairs may open into a cavern.Logical formLearned from2 sentences.