Counting Years -- in p'Bitek's Song of Lawino

Okot p'Bitek (1931-1982) was a Ugandan poet; one of his central concerns was that African literature should be built on African rather than European foundations.  His epic poem Song of Lawino (East African Publishing House, 1966) is a narrative poem written in the voice of Lawino who appeals to her husband Ocol to stay true to his own customs, and to abandon his desire to be white.  Here is a section of that poem that addresses a system for counting years.

from   Song of Lawino      by Okot p'Bitek

            *
       Ocol tells me
       Things I cannot understand,