a-a a-b a-c a-z aaa aab aac aan aau aay aaz ab- aba abb abc abn abu aby abz ac- aca acb acc acn acu acy acz an- ana anb anc ann anu any anz au- aua aub auc aun auz ay- aya ayc ayn ayu ayz az- aza azb azn azu azy azz b-u baa bab bac ban bau bay baz bba bbb bbc bbn bbu bby bca bcb bcc bcn bcu bcy bcz bna bnb bnc bnn bnu bnz bua bub buc bun buu buy buz by- bya byc byn byu byz bza bzn bzu bzz c-- caa cab cac can cau cay caz cba cbb cbc cbn cbu cby cbz cca ccb ccc ccn ccu ccz cn- cna cnb cnc cnn cnu cny cua cub cuc cun cuu cuy cuz cya cyb cyc cyn cz- czc naa nab nac nan nau nay naz nba nbb nbc nbn nbu nca ncb ncc ncn ncu nna nnb nnc nnn nnu nnz nua nub nuc nun nuu nuy nya nyc nyn nyu nyy nzb nzz ua- uaa uab uac uan uau uay uaz uba ubb ubc ubn ubu uby uca ucb ucc ucn ucu un- una unb unc unn unu uny uua uuc uun uuu uyc uyu uza uzb uzu yaa yab yac yan yau yay yaz ybc yby ybz yca ycc ycu ycy yna ynn ynu yny yua yun yuu yuy yyb yyc yyu yyy yyz yzb yzu yzy zaa zab zac zan zay zaz zbb zbc zby znc znn zub zuc zun zuz zzy zzz