a-a a-b a-c aaa aab aac aan aau aay ab- aba abb abc abn abu aby ac- aca acb acc acn acu acy an- ana anb anc ann anu any au- aua aub auc aun ay- aya ayc ayn ayu b-u baa bab bac ban bau bay bba bbb bbc bbn bbu bby bca bcb bcc bcn bcu bcy bna bnb bnc bnn bnu bua bub buc bun buu buy by- bya byc byn byu c-- caa cab cac can cau cay cba cbb cbc cbn cbu cby cca ccb ccc ccn ccu cn- cna cnb cnc cnn cnu cny cua cub cuc cun cuu cuy cya cyb cyc cyn naa nab nac nan nau nay nba nbb nbc nbn nbu nca ncb ncc ncn ncu nna nnb nnc nnn nnu nua nub nuc nun nuu nuy nya nyc nyn nyu nyy ua- uaa uab uac uan uau uay uba ubb ubc ubn ubu uby uca ucb ucc ucn ucu un- una unb unc unn unu uny uua uuc uun uuu uyc uyu yaa yab yac yan yau yay ybc yby yca ycc ycu ycy yna ynn ynu yny yua yun yuu yuy yyb yyc yyu yyy