Koo is something native americans counted. On the battelfield, the warriors in training would run up to wounded enemies, and hit them with a decorative stick- this was called "Countig Koo" and the more Koo you counted in a battle, the braver you were, and so you got more spoils and more honor-
In this sense, ignore everything i just said and assume they can spel.

(btw, the spelling error on spel is and was intentional)