a-a a-b a-i aaa aab aai aak aao aau ab- aba abb abi abk abo abu ai- aia aib aii aik aio aiu aka akb aki akk ako aku aoa aob aoi aok aoo aou au- aua aub aui auk auo b-u baa bab bai bak bao bau bba bbb bbi bbk bbo bbu bi- bia bib bii bik bio biu bka bkb bkk bko boa bob boi bok boo bou bua bub bui buk buo buu ia- iaa iab iai iao iau iba ibb ibi ibk ibo ibu iia iib iii iio iiu ika ikb iki ikk iko iku io- ioa iob ioi ioo iou iu- iua iub iui ka- kaa kab kai kak kao kau kba kbb kbi kbk kbo kbu kia kib kii kik kio kiu kkb kki kkk kku koa kob koi kok koo kou kub kui kuk kuu o-i oaa oab oai oak oao oau ob- oba obb obi obk obo obu oia oib oii oik oio oiu oka okb oki okk oko oku oo- ooa oob ooi ook ooo ou- oua oui ouk ouo ua- uaa uab uai uak uao uau uba ubb ubi ubk ubo ubu uia uib uii uio uiu uka ukb uki ukk uku uoa uob uok uoo uua uuu