Ṣàwárí

The Yoruba numeral system, which is genuinely unusual among the world's number systems in how heavily it subtracts and how many ways it lets you say one number, plus counting practice, measurement, and what can honestly be said about mathematics in Ifá.

Thirteen Yorùbá proverbs built on méjì (two) and other numerals, showing a productive formula, "two X cannot Y in the same place," used repeatedly to argue that rival powers or claims cannot share one space.