a-a a-b a-c aaa aab aac aad aaf aan aay ab- aba abb abc abd abf abn aby ac- aca acb acc acd acf acn acy ad- ada adb adc add adf adn ady af- afa afb afc afd aff afn afy an- ana anb anc and anf ann any ay- aya ayc ayd ayf ayn baa bab bac bad baf ban bay bba bbb bbc bbd bbf bbn bby bca bcb bcc bcd bcf bcn bcy bda bdb bdc bdd bdf bdy bfa bfb bfc bfd bff bfn bfy bna bnb bnc bnd bnf bnn by- bya byc byd byf byn c-- caa cab cac cad caf can cay cba cbb cbc cbd cbf cbn cby cca ccb ccc ccd ccf ccn cda cdb cdc cdd cdf cdn cdy cfa cfb cfc cfd cff cfn cn- cna cnb cnc cnd cnf cnn cny cya cyb cyc cyd cyf cyn daa dab dac dad daf dan day dba dbb dbc dbd dbf dbn dby dca dcb dcc dcd dcf dcn dda ddb ddc ddd ddf ddn ddy dfa dfb dfc dfd dff dfn dna dnb dnc dnd dnf dnn dny dy- dya dyb dyc dyd dyn dyy faa fab fac fad faf fan fay fba fbb fbc fbd fbf fbn fca fcb fcc fcd fcf fcn fcy fda fdb fdc fdd fdf fdn ffa ffc ffd fff ffn ffy fna fnb fnc fnd fnf fnn fy- fya fyb fyc fyn naa nab nac nad naf nan nay nba nbb nbc nbd nbf nbn nca ncb ncc ncd ncf ncn nda ndb ndc ndd ndf ndn ndy nfa nfb nfc nfd nff nfn nna nnb nnc nnf nnn nya nyc nyd nyf nyn nyy yaa yab yac yad yaf yan yay ybc ybf yby yca ycc ycd ycf ycy yda ydn ydy yfa yfc yfd yff yna ynd ynn yny yyb yyc yyf yyy