Kubara urupfu bigena igihe uzamara nigihe upfuye. Iyi calculatrice nayo ireba igihugu utuyemo. Kurugero mubuyapani abantu bakunda kubaho igihe kirekire. Niba ushaka kubaho igihe kirekire kandi ntupfe kubabara nyamuneka soma ibyifuzo bikurikira.