There is a classic guard combination in Brazilian Jiu-Jitsu: armbar to triangle to omoplata to triangle to armbar. As a four-stripe white belt I told myself, "You don't deserve a blue belt until you can do that combination."
So I drilled it out and drilled it out and drilled it out. Even now, I like to go through it from time-to-time and enjoy teaching it to the Beginner's Class.
Today during the morning mixed class, Professor Madama showed a variant of this combination that has to do with follow-ups from a failed armbar from the guard. This is his class recap. I'll let him do the talking: