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Dufite umurongo wibikorwa bitatu byo kuvanga ibikoresho, harimo ifu cyangwa ibikoresho bya granular bivanga, ifu nivanga ryamazi.

Buri gihe icyitegererezo kibanziriza umusaruro mbere yumusaruro rusange;

Buri gihe Ubugenzuzi bwa nyuma mbere yo koherezwa; twemeye SGS cyangwa ubundi bugenzuzi bwabandi.

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