A male may hear a female on stairs.Logical formLearned from8 sentences. Persons may use stairs.Logical formLearned from8 sentences. A female may stomp_up stairs.Logical formLearned from8 sentences. A spot can be on stairs.Logical formLearned from8 sentences. A bottom may pertain-to a (stair case).Logical formLearned from8 sentences. Age may use a stair.Logical formLearned from8 sentences. A female may lie on stairs.Logical formLearned from8 sentences. Stairs may be located.Logical formLearned from8 sentences. A person may make a way to stairs.Logical formLearned from8 sentences. A male may go stairs.Logical formLearned from8 sentences. Footfalls can be on stairs.Logical formLearned from8 sentences. Stairs can be clear.Logical formLearned from8 sentences. A person may creep_down stairs.Logical formLearned from8 sentences. (Basement stairs) may pertain-to a person.Logical formLearned from8 sentences. A person may run_up a flight of stairs.Logical formLearned from8 sentences.