A person may run_down stairs.Logical formLearned from14 sentences. A person may go_up a stair.Logical formLearned from14 sentences. A person may walk to stairs.Logical formLearned from14 sentences. Persons can be on stairs.Logical formLearned from14 sentences. A stair can be dark.Logical formLearned from14 sentences. Stairs may pertain-to a plane.Logical formLearned from14 sentences. A (stair turret) can be at a corner.Logical formLearned from13 sentences. Stairs may be carpeted.Logical formLearned from13 sentences. Stairs may end.Logical formLearned from13 sentences. Stairs may pertain-to a station.Logical formLearned from13 sentences. A female may fall_down stairs.Logical formLearned from13 sentences. Persons may go_down stairs.Logical formLearned from13 sentences. A shaft can be in stairs.Logical formLearned from13 sentences. A male may stand at a bottom of stairs.Logical formLearned from13 sentences. Some flights can be constituted-of-or-filled-with (marble stairs).Logical formLearned from13 sentences.