A male may sprint_down stairs.Logical formLearned from4 sentences. Stairs may lead to a basement.Logical formLearned from4 sentences. A second turning may pertain-to a stair.Logical formLearned from4 sentences. Stairs may pertain-to an arena.Logical formLearned from4 sentences. A male may head_up stairs to a room.Logical formLearned from4 sentences. A male may jog_down stairs.Logical formLearned from4 sentences. A person may take stairs.Logical formLearned from4 sentences. Persons may run stairs.Logical formLearned from4 sentences. Access can be with stairs.Logical formLearned from4 sentences. Toys can be on stairs.Logical formLearned from4 sentences. Stairs can be a metal.Logical formLearned from4 sentences. Stairs can be (death trap).Logical formLearned from4 sentences. An indoor waterfall can be over stairs.Logical formLearned from4 sentences. A person may go_up a flight of stairs.Logical formLearned from4 sentences. A person may run_up a set of stairs.Logical formLearned from4 sentences.