Narrow stairs may lead.Logical formLearned from25 sentences. A male may fall_down some stairs.Logical formLearned from24 sentences. A female can be on stairs.Logical formLearned from24 sentences. Persons may run_up stairs.Logical formLearned from24 sentences. A door can be at a top of stairs.Logical formLearned from24 sentences. A person may get to a bottom of stairs.Logical formLearned from24 sentences. Persons can be under stairs.Logical formLearned from24 sentences. Persons may descend stairs.Logical formLearned from23 sentences. Stairs may pertain-to a bus.Logical formLearned from23 sentences. Steps may pertain-to stairs.Logical formLearned from23 sentences. Persons may get to a top of stairs.Logical formLearned from23 sentences. A hole can be in stairs.Logical formLearned from23 sentences. Persons may run_down stairs.Logical formLearned from23 sentences. A dark can be at a top of stairs.Logical formLearned from22 sentences. A male may stand on stairs.Logical formLearned from22 sentences.