Icyuma nicyuma birashobora kugabanywamo ibice byo gutanura hamwe nicyuma cyo gukora ibyuma. Ku ruhande rwa mbere, iyambere ikorwa no gushonga no kugabanya ubutare bwicyuma mu itanura riturika. Kurundi ruhande, iyanyuma ikorwa mugihe cyo gukora ibyuma muguhindura ibice byicyuma.