a-a a-b a-c aaa aab aac aad aan aau aay ab- aba abb abc abd abn abu aby ac- aca acb acc acd acn acu acy ad- ada adb adc add adn adu ady an- ana anb anc and ann anu any au- aua aub auc aud aun ay- aya ayc ayd ayn ayu b-u baa bab bac bad ban bau bay bba bbb bbc bbd bbn bbu bby bca bcb bcc bcd bcn bcu bcy bda bdb bdc bdd bdu bdy bna bnb bnc bnd bnn bnu bua bub buc bud bun buu buy by- bya byc byd byn byu c-- caa cab cac cad can cau cay cba cbb cbc cbd cbn cbu cby cca ccb ccc ccd ccn ccu cda cdb cdc cdd cdn cdu cdy cn- cna cnb cnc cnd cnn cnu cny cua cub cuc cud cun cuu cuy cya cyb cyc cyd cyn daa dab dac dad dan dau day dba dbb dbc dbd dbn dbu dby dca dcb dcc dcd dcn dcu dda ddb ddc ddd ddn ddu ddy dna dnb dnc dnd dnn dny dua dub duc dud dun duy dy- dya dyb dyc dyd dyn dyu dyy naa nab nac nad nan nau nay nba nbb nbc nbd nbn nbu nca ncb ncc ncd ncn ncu nda ndb ndc ndd ndn ndu ndy nna nnb nnc nnn nnu nua nub nuc nud nun nuu nuy nya nyc nyd nyn nyu nyy ua- uaa uab uac uad uan uau uay uba ubb ubc ubn ubu uby uca ucb ucc ucd ucn ucu uda udb udc udd udn udu un- una unb unc und unn unu uny uua uuc uun uuu uyc uyu yaa yab yac yad yan yau yay ybc yby yca ycc ycd ycu ycy yda ydn ydy yna ynd ynn ynu yny yua yud yun yuu yuy yyb yyc yyu yyy