 There are eight falling pairs /ia/, /ie/, /io/, /ea/, /ua/, /uo/, /ue/, and /oa/, eight rising pairs /ai/, /au/, /ei/, /eu/, /oi/, /ou/, /ae/, and /ao/, and four level pairs /iu/, /eo/, /ui/, and /oe/.The terms rising, falling and level refer to the rise or fall of sonority of the diphthongs.Within Wuvulu, there are three vowel pairs that do not exist that are common in other languages.