1. Ibindi bice ni ingamba zo kurwanya ingese no kurwanya ruswa, zishobora guhuza n’imikorere mibi, kandi ubuzima bwa serivisi bushobora kugera ku myaka 20.
2. Ububoshyi bwurushundura rukoresha ikoranabuhanga rizunguruka, ryongera imikorere ya elastique no kuryama, kandi rishobora guhuza no guhindura imikorere yo kwagura ubushyuhe no kugabanuka, kuburyo uruzitiro rwa net ruhora rukomeza guhagarara neza.
3. Imiterere yoroshye, kubungabunga byoroshye, igihe gito cyo kubaka, ingano ntoya nuburemere bworoshye, byoroshye gutwara no gushiraho.