Ko tenei momo keri keri he mea hoahoa me te hanga i runga i nga paerewa API.
He hanganga kiato te rig katoa, e tika ana kia iti te waahi whakauru na te nui o te whakaurunga.
Ko te tahuhu taumaha me te taraiwa-a-whaiaro: 8 × 6, 10 × 8, 12 × 8,14 × 8, 14 × 12, 16 × 12 me te pūnaha urungi waipēhi e whakamahia ana, e whakarite ana i te rig keri he huarahi pai, te kaha whakawhiti whenua.