a-a a-b a-i aaa aab aai aau aay ab- aba abb abi abu aby ai- aia aib aii aiu aiy au- aua aub aui ay- aya ayi ayu b-u baa bab bai bau bay bba bbb bbi bbu bby bi- bia bib bii biu biy bua bub bui buu buy by- bya byi byu ia- iaa iab iai iau iba ibb ibi ibu iby iia iib iii iiu iu- iua iub iui iya iyy ua- uaa uab uai uau uay uba ubb ubi ubu uby uia uib uii uiu uua uuu uyi uyu yaa yab yai yau yay ybi yby yii yua yui yuu yuy yyb yyu yyy