1. Ko te hanganga matū he silica inert, a kahore he āwangawanga mo te pokanoa mahi matū;
2. Matūriki rapa porohita. Ka taea te whakamahi i nga wa katoa
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7. Ko te mea mahi kua tukatukahia he hua matt, ka whakaatu i te tae whakarewa, kaore e waikura, me etahi atu, kaore hoki e tika kia kohia me te whakairo.
