What is the fine-grained topic of the following text: We were also taught that method in our first year at Stoke Park, but the inspirational Mrs. Sayers helped us remember it by: Sir Oliver's Horse Came Ambling Home To Oliver's Aunt And 3 decades or so later I still found that useful when I wanted to work out how to make our folding staircase for the attic! Only return the topic.
Using mnemonic devices to remember staircase construction method