A door may intersect stairs.Logical formLearned from2 sentences. Stairs may pertain-to an underground.Logical formLearned from2 sentences. Stairs may lead to freedom.Logical formLearned from2 sentences. A person may climb lots of stairs.Logical formLearned from2 sentences. (Marble stairs) may be inclined to a shrine.Logical formLearned from2 sentences. Stairs may be swept.Logical formLearned from2 sentences. Stairs may pertain-to an auditorium.Logical formLearned from2 sentences. A stair may pertain-to a (fitness room).Logical formLearned from2 sentences. Clutter can be on stairs.Logical formLearned from2 sentences. Infants may realize a danger of fall_downing stairs.Logical formLearned from2 sentences. Footsteps can be on stairs.Logical formLearned from2 sentences. Premises may be accessed by stairs.Logical formLearned from2 sentences. Presence may pertain-to stairs.Logical formLearned from2 sentences. A concern can be about stairs.Logical formLearned from2 sentences. Stairs can be at a health-service.Logical formLearned from2 sentences.