(Wave stairs) can be occupying.Logical formLearned from2 sentences. A stair can be perilous.Logical formLearned from2 sentences. A location may pertain-to stairs.Logical formLearned from2 sentences. A male may lead_up a female a flight of stairs.Logical formLearned from2 sentences. A person may go_down some flights of (cement stairs).Logical formLearned from2 sentences. Children may climb stairs.Logical formLearned from2 sentences. Stairs may lead to a group of buildings.Logical formLearned from2 sentences. Stairs may lead to some room.Logical formLearned from2 sentences. A person may walk_down stairs to a terminal.Logical formLearned from2 sentences. Stairs may be enarbored by vines.Logical formLearned from2 sentences. Balustrades may pertain-to stairs.Logical formLearned from2 sentences. Stairs may go_up to bedrooms.Logical formLearned from2 sentences. A president may descend stairs.Logical formLearned from2 sentences. Persons may make stairs.Logical formLearned from2 sentences. A person may climb stairs of a subway.Logical formLearned from2 sentences.