A person may walk_up a flight of stairs.Logical formLearned from7 sentences. Persons may be chop_uped by a stair.Logical formLearned from7 sentences. Persons may walk_up stairs.Logical formLearned from7 sentences. A voice may float_up stairs.Logical formLearned from7 sentences. Persons may come_down stairs.Logical formLearned from7 sentences. Stairs may cry.Logical formLearned from7 sentences. Stairs may lead to an exit.Logical formLearned from7 sentences. A male may run_up stairs to a room.Logical formLearned from7 sentences. Stairs may go_up.Logical formLearned from7 sentences. Stairs may lead_up to a second floor.Logical formLearned from7 sentences. A male may sit on a stair.Logical formLearned from7 sentences. A male may find stairs.Logical formLearned from7 sentences. A person may fall_down a flight of stairs.Logical formLearned from7 sentences. A beginning may pertain-to stairs.Logical formLearned from7 sentences. A male may skip_down stairs.Logical formLearned from7 sentences.