A person may hear upon a stair.Logical formLearned from3 sentences. Persons may pass_up a stair.Logical formLearned from3 sentences. Persons may withdrew_down a stair.Logical formLearned from3 sentences. Feet may clatter_up a stair.Logical formLearned from3 sentences. Visitors may climb stairs.Logical formLearned from3 sentences. Stairs may lead to a hall.Logical formLearned from3 sentences. Stairs may lead_down to a basement.Logical formLearned from3 sentences. A person may walk toward stairs.Logical formLearned from3 sentences. A doorway can be at a top of stairs.Logical formLearned from3 sentences. Stairs can be with handrails.Logical formLearned from3 sentences. Stairs may pertain-to a (donnybrook tram).Logical formLearned from3 sentences. Stairs can be to the left.Logical formLearned from3 sentences. Cows may walk_up stairs.Logical formLearned from3 sentences. A stair may be built.Logical formLearned from3 sentences. A landing can be on stairs.Logical formLearned from3 sentences.