A person may linger on stairs.Logical formLearned from2 sentences. A floor of stairs may crack.Logical formLearned from2 sentences. A noise may be heard upon stairs.Logical formLearned from2 sentences. Others can be on stairs.Logical formLearned from2 sentences. Stairs can be a part of a bridge.Logical formLearned from2 sentences. An undertaker may mount to a top of a first flight of stairs.Logical formLearned from2 sentences. A footstep may be heard upon stairs.Logical formLearned from2 sentences. A clock can be upon stairs.Logical formLearned from2 sentences. A daily may grope narrow stairs.Logical formLearned from2 sentences. Persons may touch stairs.Logical formLearned from2 sentences. Persons may get to a foot of stairs.Logical formLearned from2 sentences. A quick step may ascend stairs.Logical formLearned from2 sentences. A female may have (stone stairs).Logical formLearned from2 sentences. A stair may pertain-to a man.Logical formLearned from2 sentences. A male may descend a stair.Logical formLearned from2 sentences.