Footsteps may sound on stairs.Logical formLearned from5 sentences. Persons can be on stairs.Logical formLearned from5 sentences. Stairs may pertain-to an office.Logical formLearned from5 sentences. A cross can be between a (stair climber).Logical formLearned from5 sentences. Stairs can be to a top.Logical formLearned from5 sentences. A male may run_up some flights of stairs.Logical formLearned from5 sentences. A person may use stairs.Logical formLearned from5 sentences. Stairs can be to a male.Logical formLearned from5 sentences. Stairs may pertain-to an entrance.Logical formLearned from5 sentences. A person may climb stairs to an office.Logical formLearned from5 sentences. A male may descend stairs from a plane.Logical formLearned from5 sentences. Stairs can be unsafe.Logical formLearned from5 sentences. Stairs may pertain-to a cathedral.Logical formLearned from5 sentences. A memory can be on stairs of a cathedral.Logical formLearned from5 sentences. Stairs may pertain-to an airplane.Logical formLearned from5 sentences.