Ibikoresho byumwaka bigira teeh hejuru yimbere ya rm. Ibikoresho byimbere burigihe meshes hamwe nibikoresho byo hanze.
Iyo ameng ibikoresho bibiri byo hanze, azenguruka biboneka mubyerekezo bivuguruzana .Iyo hunga ibikoresho byimbere hamwe nibikoresho byo hanze bizunguruka kubyerekezo bimwe.
Bikwiye gufatwa no gutagurukira umubare wamenyo kuri buri kikoresho mugihe cyo kwishongora binini (imbere) hamwe nigikoresho gito (cyo hanze), kubera ko ubwoko butatu bwo kwivanga bushobora kubaho.
Mubisanzwe ibikoresho byimbere bitwarwa nibikoresho bito byo hanze.
Yemerera igishushanyo mbonera cy'imashini.