Ibisobanuro bigufi:

Inyongeramusaruro nimwe mubikoresho fatizo byo gutwikira.Umubare muto winyongera urashobora kunoza cyane imikorere nigikorwa cyo gutwikira, kandi birashobora no kunoza imikorere ya firime yo gutwikira, kandi bikagira uruhare mukumenyekanisha ibicuruzwa.