Some (mahogany doors) can be at a top of stairs.Logical formLearned from12 sentences. A male may walk_up stairs.Logical formLearned from12 sentences. Stairs may be added.Logical formLearned from12 sentences. Stairs can be wide.Logical formLearned from12 sentences. A stair can be enclosed.Logical formLearned from12 sentences. A space can be under stairs.Logical formLearned from12 sentences. A stair can be open.Logical formLearned from12 sentences. A male may dash_down stairs.Logical formLearned from12 sentences. A male may hear footsteps on stairs.Logical formLearned from12 sentences. Stairs can be regular.Logical formLearned from12 sentences. Trouble may climb stairs.Logical formLearned from12 sentences. Stairs can be in a home.Logical formLearned from12 sentences. Everyone may run_down stairs.Logical formLearned from12 sentences. Stairs can be mobile.Logical formLearned from11 sentences. A male may creep_down stairs.Logical formLearned from11 sentences.