Ko e meʻalele fika 0 ʻi he fakatātaá ko hoʻo meʻalele. ʻOkú ke tatali ke afe toʻomataʻu ki tuʻa mei he vaʻa hala ʻoku ngata ʻi ha fetaulakiʻanga T. ʻOku fakaofi ʻa e X mo e Y ʻi he hala ʻoku hokohoko atú mei he ongo tafaʻaki fehangahangai. ʻE afe toʻohema ʻa e Z ʻi ho tafaʻaki ʻi ha hala makehe ʻoku ʻikai fepaki mo hoʻo halá. Ko fē feʻaluʻaki kuo pau ke ke tuku ke fakalaka kimuʻa pea hū? ʻOku ʻikai ha papa, maama pe tuʻutuʻuni polisi kehe ʻoku liliu ʻa e totonu ke muʻomuʻa kuo fakamatalaʻi.