a-a a-b aaa aab aad aao aau aay ab- aba abb abd abo abu aby ad- ada adb add ado adu ady aoa aob aod aoo aou au- aua aub aud auo ay- aya ayd ayo ayu b-u baa bab bad bao bau bay bba bbb bbd bbo bbu bby bda bdb bdd bdo bdu bdy boa bob bod boo bou boy bua bub bud buo buu buy by- bya byd byo byu daa dab dad dao dau day dba dbb dbd dbo dbu dby dda ddb ddd ddo ddu ddy doa dob dod doo dou doy dua dub dud duo duy dy- dya dyb dyd dyo dyu dyy oaa oab oad oao oau ob- oba obb obd obo obu oby oda odb odd odo odu oo- ooa oob ood ooo ou- oua oud ouo oya oyd oyo ua- uaa uab uad uao uau uay uba ubb ubo ubu uby uda udb udd udo udu uoa uob uod uoo uua uuu uyo uyu yaa yab yad yao yau yay yby yda ydo ydy yob yod yoo you yoy yua yud yuo yuu yuy yyb yyu yyy