a-a a-b aaa aab aan aao aau aay ab- aba abb abn abo abu aby an- ana anb ann ano anu any aoa aob aon aoo aou au- aua aub aun auo ay- aya ayn ayo ayu b-u baa bab ban bao bau bay bba bbb bbn bbo bbu bby bna bnb bnn bno bnu boa bob bon boo bou boy bua bub bun buo buu buy by- bya byn byo byu naa nab nan nao nau nay nba nbb nbn nbo nbu nna nnb nnn nno nnu no- noa nob non noo nou noy nua nub nun nuo nuu nuy nya nyn nyo nyu nyy oaa oab oan oao oau ob- oba obb obn obo obu oby on- ona onb onn ono onu ony oo- ooa oob oon ooo ou- oua oun ouo oya oyo ua- uaa uab uan uao uau uay uba ubb ubn ubo ubu uby un- una unb unn uno unu uny uoa uob uon uoo uua uun uuu uyo uyu yaa yab yan yao yau yay yby yna ynn ynu yny yob yon yoo you yoy yua yun yuo yuu yuy yyb yyu yyy