Ijoyinti yokunciphisa intambo yangaphandle ekabili ibizwa nangokuthi ijoyinti lokunciphisa eliyi-hexagonal kanye nejoyinti elinentambo eyi-hexagonal.Kuyinguqulo yokuziphendukela kwemvelo yejoyinti elinentambo yobubanzi obulinganayo.;Okwamanje, ibanga losayizi esingalinikeza liphakathi kweyintshi elingu-1/4 no-4 iyintshi.