okosa.
3.

okosa urapun = 2-1.
4.

okosa okosa = 2-2.
5.

okosa okosa urapun = 2-2-1.
6.

okosa okosa okosa = 2-2-2.
Anything above 6 they call _ras_, a lot.
For the sake of uniformity we may speak of this as a "system." But in so doing, we give to the legitimate meaning of the word a severe strain.