A foot can be on a stair.Logical formLearned from2 sentences. Stairs can be unusable.Logical formLearned from2 sentences. Stairs may descend.Logical formLearned from2 sentences. (Subway riders) may take stairs.Logical formLearned from2 sentences. A flight of stairs may lead to a pool.Logical formLearned from2 sentences. A greek word can be for stairs.Logical formLearned from2 sentences. Stairs may pertain-to an (apartment complex).Logical formLearned from2 sentences. Access can be by stairs.Logical formLearned from2 sentences. Stairs may appear.Logical formLearned from2 sentences. A male may say at a bottom of stairs.Logical formLearned from2 sentences. Stairs can be treacherous.Logical formLearned from2 sentences. Persons may sit at a bottom of stairs.Logical formLearned from2 sentences. A female may sleep on stairs.Logical formLearned from2 sentences. A corner can be at a bottom of stairs.Logical formLearned from2 sentences. A group may descend stairs.Logical formLearned from2 sentences.