Stairs may lead to a roof.Logical formLearned from12 sentences. A male may stomp_up stairs.Logical formLearned from12 sentences. A stair can be wide.Logical formLearned from12 sentences. A person may walk_up some stairs.Logical formLearned from12 sentences. Stairs can be stupid.Logical formLearned from12 sentences. A person may do stairs.Logical formLearned from12 sentences. A person may walk_down some flights of stairs.Logical formLearned from12 sentences. Narrow stairs can be steep.Logical formLearned from12 sentences. Stairs can be on the left.Logical formLearned from12 sentences. A person may climb a flight of stairs.Logical formLearned from12 sentences. Footsteps may ascend stairs.Logical formLearned from12 sentences. Stairs may be pushed against a wall.Logical formLearned from12 sentences. Stairs may lead to a second floor.Logical formLearned from12 sentences. A person may head for stairs.Logical formLearned from12 sentences. Stairs may pertain-to a courthouse.Logical formLearned from12 sentences.