I wanted to ask this some time ago, but assumed that it would be dismissed as "fatuous". To my gratification, Joonas has blazed the trail with his excellent Q: Did the Romans use 'animus' and 'anima' together?, a compare-&-contrast of near-identical words.
My rhyming couplet consists of favourite adverbs, "nequiquam" = "in vain", and "nequaquam" = "by no means"; "not at all" (Oxford).
I have never seen these two used together, perhaps they never were but could have been?
"nequaquam (erat) nequiquam Romam veni.";
"It was by no means in vain that I came to Rome."
Thanks to TKR.
"nequaquam nequiquam Romam veni."
Accepting that the two adverbs would not have been used together, an alternative:
"nullo modo nequiquam Romam veni."
"By no measure did I come to Rome in vain."