A post can be on stairs.Logical formLearned from2 sentences. Persons may use stairs.Logical formLearned from2 sentences. A piano may fall_down stairs.Logical formLearned from2 sentences. Stairs can be multi-colored.Logical formLearned from2 sentences. A second floor can be accessible by stairs.Logical formLearned from2 sentences. Blood can be on stairs.Logical formLearned from2 sentences. Flames may shoot_up stairs.Logical formLearned from2 sentences. Stairs can be by a lift.Logical formLearned from2 sentences. Persons may start for stairs.Logical formLearned from2 sentences. Difficulty can be in climbing stairs.Logical formLearned from2 sentences. A person may sit_down on a step of stairs.Logical formLearned from2 sentences. A step may reach a foot of stairs.Logical formLearned from2 sentences. A man may descend stairs.Logical formLearned from2 sentences. A step may sound on stairs.Logical formLearned from2 sentences. Stairs may pertain-to a pulpit.Logical formLearned from2 sentences.