A person may walk some flights of stairs.Logical formLearned from11 sentences. A male may follow_up a male stairs.Logical formLearned from11 sentences. Stairs can be in an atrium.Logical formLearned from11 sentences. A worm may climb_up a winding stair.Logical formLearned from11 sentences. A female may bound_up stairs.Logical formLearned from11 sentences. A rest may take stairs.Logical formLearned from11 sentences. Persons may walk stairs.Logical formLearned from11 sentences. A male may go to stairs.Logical formLearned from11 sentences. A set can be constituted-of-or-filled-with (spiral stairs).Logical formLearned from11 sentences. A stair may undergo a turning.Logical formLearned from11 sentences. Stairs may undergo a creaking.Logical formLearned from11 sentences. Someone may climb over some floors of stairs.Logical formLearned from11 sentences. A flight can be constituted-of-or-filled-with winding stairs.Logical formLearned from11 sentences. A step can be on stairs.Logical formLearned from11 sentences. Stairs can be behind a person.Logical formLearned from11 sentences.