Stairs may wait.Logical formLearned from2 sentences. Stairs may pertain-to a plane.Logical formLearned from2 sentences. A time can be on stairs.Logical formLearned from2 sentences. Persons may come_up stairs.Logical formLearned from2 sentences. Stairs may pertain-to a dugout.Logical formLearned from2 sentences. Stairs may help.Logical formLearned from2 sentences. Stairs can be for safety.Logical formLearned from2 sentences. A total length may pertain-to stairs.Logical formLearned from2 sentences. Stairs may pull.Logical formLearned from2 sentences. Stairs may lead to an entrance.Logical formLearned from2 sentences. Some men may descend stairs.Logical formLearned from2 sentences. Buildings may have stairs.Logical formLearned from2 sentences. Stairs may pertain-to a stage.Logical formLearned from2 sentences. A run may pertain-to stairs.Logical formLearned from2 sentences. A person may say on stairs.Logical formLearned from2 sentences.