Doors can be closest to stairs.Logical formLearned from7 sentences. A male may tumble_down stairs.Logical formLearned from7 sentences. A network can be constituted-of-or-filled-with stairs.Logical formLearned from7 sentences. Some stairs can be to a street.Logical formLearned from7 sentences. Stairs may go_up to a second floor.Logical formLearned from7 sentences. A (stair case) can be wooden.Logical formLearned from7 sentences. Stairs can be to a platform.Logical formLearned from7 sentences. Stairs may be used.Logical formLearned from7 sentences. A width may pertain-to stairs.Logical formLearned from7 sentences. A person may go_up some stairs.Logical formLearned from7 sentences. A person may sit on a stair.Logical formLearned from7 sentences. Difficulties may climb stairs.Logical formLearned from7 sentences. Access can be to stairs.Logical formLearned from7 sentences. Stairs may be installed.Logical formLearned from7 sentences. A (stair lift) may undergo an installation.Logical formLearned from7 sentences.