Q derives from the mathematical notation Ken Iverson developed at Harvard. Years before, when Ken was a young man in Alberta, a farmer he worked for asked him if he knew how to use a certain tool. Ken didn’t. “Well,” said the farmer, “you won’t learn it younger.”
Amending past folly, I’ve hired someone to teach me guitar at last. Part of my homework is to map notes to the frets on the guitar neck. Here’s my assignment. Can you complete it as a single expression in q?