1. Recondite: Abstruse
2. Abstruse: Enigmatic
3. Enigmatic: Cabalistic
4. Cabalistic: Arcane
5. Arcane: Esoteric
6. Esoteric: Hermetic
7. Hermetic: Recondite
(This all started when I saw the definition of recondite including the word "abstruse")
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
abstruse : arcane
arcane : esoteric
Found this going back and forth in 4 different online dictionaries.
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.