A person may find stairs.Logical formLearned from15 sentences. A person may do stairs.Logical formLearned from15 sentences. A man can be on stairs.Logical formLearned from15 sentences. A male may go_up stairs.Logical formLearned from15 sentences. A person may stand on stairs.Logical formLearned from15 sentences. A person may run_up some flights of stairs.Logical formLearned from15 sentences. A turn may pertain-to stairs.Logical formLearned from15 sentences. A person may sit_down on stairs.Logical formLearned from15 sentences. A person may mount stairs.Logical formLearned from15 sentences. A person may climb some stairs.Logical formLearned from15 sentences. A banister may pertain-to stairs.Logical formLearned from14 sentences. Persons may take stairs.Logical formLearned from14 sentences. Stairs can be black.Logical formLearned from14 sentences. Stairs can be treacherous.Logical formLearned from14 sentences. A male may make for stairs.Logical formLearned from14 sentences.