20 Naho ku birebana n’ibanga ryera ry’inyenyeri zirindwi wabonye mu kiganza cyanjye cy’iburyo, n’ibitereko birindwi by’amatara bikozwe muri zahabu, izo nyenyeri zirindwi zigereranya abamarayika b’amatorero arindwi, naho ibitereko birindwi by’amatara bikagereranya amatorero arindwi.+