Plain Bob Triples As late as the 1980s the Diary was using the convention for W & M that didn't fit the coursing order convention. I discovered that while rehearsing in my head a quarter that I was going to call, on my way to the church. At the end I hadn't got to 53246. I assumed I had made a slip and went through it all again but got the same result. When I got to the tower I wrote it out on paper to check. Fortunately something (can't remember what) gave me the idea of swapping over W & M and then the composition worked.
If I hadn't rehearsed calling it I would only have found the problem when it failed to come round at the end, which would have been embarrassing!