a-a a-b a-z aaa aab aan aau aay aaz ab- aba abb abn abu aby abz an- ana anb ann anu any anz au- aua aub aun auz ay- aya ayn ayu ayz az- aza azb azn azu azy azz b-u baa bab ban bau bay baz bba bbb bbn bbu bby bna bnb bnn bnu bnz bua bub bun buu buy buz by- bya byn byu byz bza bzn bzu bzz naa nab nan nau nay naz nba nbb nbn nbu nna nnb nnn nnu nnz nua nub nun nuu nuy nya nyn nyu nyy nzb nzz ua- uaa uab uan uau uay uaz uba ubb ubn ubu uby un- una unb unn unu uny uua uun uuu uyu uza uzb uzu yaa yab yan yau yay yaz yby ybz yna ynn ynu yny yua yun yuu yuy yyb yyu yyy yyz yzb yzu yzy zaa zab zan zay zaz zbb zby znn zub zun zuz zzy zzz