Feppmaandu wuute gi ci sumb yi

'''Feppmaandu''' as [[wàll-wàllaan]]u [[xarefulwonxarefulwoon]] bi la. Di wenn ci wàll-wàllaan yi dàtt [[saalu xarefulwonxarefulwoon]] bi. Ni ko turam di junjee, feppmaandu dafa maandu moo tax amul [[yanu mbëj]] (du bu baax(+) mbaa bu bon(-)). Feppmaandu yeek [[feppsaal]] yi su ñu leen boolee ñooy nekk saalu xarefulwon bi. Ngir ab xarefulwonxarefulwoon, dañuy bind '''Z''' limu feppsaal yi, '''A''' di limu feppsaal + feppmaandu. Kon limu feppmaandu yi dafay doon N =A-Z.