Ubwiza bwibintu bimwe, imiterere ya lamellar yuzuye, hejuru iringaniye kandi yoroshye, ntabwo byoroshye guhinduka, imikorere ihamye ,.
urumuri rworoshye kandi rworoshye, ntabwo byoroshye gusenyuka impande zose, uburyohe, kutagira imirasire hamwe nu mwuka mwiza.