Did you follow all that? Good.
Incidentally, I stumbled onto this information while reading "The Complete Fly Tier" by Rube Cross, an absolutely excellent older book which I'll share with you in a future article.
There you go. Now you can dazzle all your friends at your next fly tying gathering or whenever you bump into other fly anglers. Folks will be amazed at your vast knowledge & you're sure to be the life of the party!