(Apartment stairs) may pertain-to a person.Logical formLearned from8 sentences. Stairs can be impossible.Logical formLearned from8 sentences. A person may tumble_down stairs.Logical formLearned from8 sentences. Stairs can be a place.Logical formLearned from8 sentences. Stairs can be said.Logical formLearned from8 sentences. Stairs can be to some side.Logical formLearned from8 sentences. Bottom may pertain-to stairs.Logical formLearned from8 sentences. A female may stand on stairs.Logical formLearned from8 sentences. A female may sit_down on stairs.Logical formLearned from8 sentences. A female may climb stairs to a room.Logical formLearned from8 sentences. A person may head_up stairs.Logical formLearned from8 sentences. Some flights can be constituted-of-or-filled-with stair.Logical formLearned from8 sentences. A female may get to a top of stairs.Logical formLearned from8 sentences. A voice may shout_up stairs.Logical formLearned from8 sentences. Stairs may be collapsed by an earthquake.Logical formLearned from8 sentences.