Stairs may relax.Logical formLearned from2 sentences. A sputum may fall on stairs.Logical formLearned from2 sentences. Older persons can be on stairs.Logical formLearned from2 sentences. A person may take stairs.Logical formLearned from2 sentences. A (fire stair) can be next to an elevator.Logical formLearned from2 sentences. Some stairs can be onto (floor mats).Logical formLearned from2 sentences. An approach can be to stairs.Logical formLearned from2 sentences. A stair may be made.Logical formLearned from2 sentences. A door can be from stairs.Logical formLearned from2 sentences. A male may climb narrow stairs.Logical formLearned from2 sentences. A female may sneak_down stairs.Logical formLearned from2 sentences. A rail may be mounted to treads of stairs.Logical formLearned from2 sentences. A female may leave stairs.Logical formLearned from2 sentences. A person may stick to stairs.Logical formLearned from2 sentences. A male may see a male on stairs.Logical formLearned from2 sentences.