Stairs may pertain-to servants.Logical formLearned from10 sentences. Stairs can be filthy.Logical formLearned from10 sentences. A person may follow_up a male stairs.Logical formLearned from10 sentences. A male may sit at a top of stairs.Logical formLearned from10 sentences. Stairs can be difficult.Logical formLearned from10 sentences. Feet can be on stairs.Logical formLearned from10 sentences. Stairs may undergo an ascent.Logical formLearned from10 sentences. A corridor may lead to stairs.Logical formLearned from10 sentences. Stairs may move.Logical formLearned from10 sentences. Stairs can be in a building.Logical formLearned from10 sentences. (Marble stairs) may pertain-to a building.Logical formLearned from10 sentences. Stairs may pertain-to an (apartment block).Logical formLearned from10 sentences. A male may run_up stairs.Logical formLearned from10 sentences. A male may descend a flight of stairs.Logical formLearned from10 sentences. A male may climb stairs to an apartment.Logical formLearned from10 sentences.