Iyi myenda ya kera, izwiho kugereranya 2 x 2 igitebo, ubworoherane bwo gushushanya, gukoresha byinshi, no gukora.Ubwinshi bwamahitamo yo gufungura (1% / 3% / 5% / 10%) namabara atanga amahirwe yo guhuza intego nyinshi zishushanya nkibanga, izuba ryumunsi, hamwe nubushyuhe bwumuriro.