a-a a-b a-c a-z aaa aab aac aah aan aay aaz ab- aba abb abc abh abn aby abz ac- aca acb acc ach acn acy acz aha ahb ahc ahh ahn ahy ahz an- ana anb anc anh ann any anz ay- aya ayc ayh ayn ayz az- aza azb azn azy azz baa bab bac bah ban bay baz bba bbb bbc bbh bbn bby bca bcb bcc bch bcn bcy bcz bha bhb bhc bhh bna bnb bnc bnn bnz by- bya byc byh byn byz bza bzh bzn bzz c-- caa cab cac cah can cay caz cba cbb cbc cbh cbn cby cbz cca ccb ccc cch ccn ccz ch- cha chb chc chh chn chy chz cn- cna cnb cnc cnh cnn cny cya cyb cyc cyn cz- czc haa hab hac hah han hay haz hba hbb hbc hbh hbn hby hbz hca hcb hcc hch hcn hcy hha hhb hhc hhh hhn hhy hhz hna hnb hnc hnh hnn hny hnz hy- hya hyb hyc hyh hyn hyy hzy naa nab nac nah nan nay naz nba nbb nbc nbn nca ncb ncc nch ncn nha nhb nhc nhh nhn nhy nhz nna nnb nnc nnh nnn nnz nya nyc nyn nyy nzb nzz yaa yab yac yah yan yay yaz ybc yby ybz yca ycc ych ycy yha yhc yna ynn yny yyb yyc yyy yyz yzb yzy zaa zab zac zah zan zay zaz zbb zbc zby zha zhc znc znn zzy zzz