a-a a-b a-c aaa aab aac aah aan aar aay ab- aba abb abc abh abn abr aby ac- aca acb acc ach acn acr acy aha ahb ahc ahh ahn ahr ahy an- ana anb anc anh ann anr any ar- ara arb arc arh arn arr ary ay- aya ayc ayh ayn ayr baa bab bac bah ban bar bay bba bbb bbc bbh bbn bbr bby bca bcb bcc bch bcn bcr bcy bha bhb bhc bhh bhr bna bnb bnc bnn bnr bra brb brh brn brr bry by- bya byc byh byn byr c-- caa cab cac cah can car cay cba cbb cbc cbh cbn cbr cby cca ccb ccc cch ccn ccr ch- cha chb chc chh chn chr chy cn- cna cnb cnc cnh cnn cnr cny cra crb crc crh crn crr cry cya cyb cyc cyn cyr haa hab hac hah han har hay hba hbb hbc hbh hbn hbr hby hca hcb hcc hch hcn hcr hcy hha hhb hhc hhh hhn hhr hhy hna hnb hnc hnh hnn hny hr- hra hrb hrc hrh hrn hrr hy- hya hyb hyc hyh hyn hyr hyy naa nab nac nah nan nar nay nba nbb nbc nbn nbr nca ncb ncc nch ncn ncr nha nhb nhc nhh nhn nhr nhy nna nnb nnc nnh nnn nra nrb nrc nrn nrr nry nya nyc nyn nyy ra- raa rab rac rah ran rar ray rba rbb rbc rbh rbn rbr rca rcb rcc rch rcn rcr rh- rha rhb rhc rhh rhn rhr rna rnb rnc rnh rnn rnr rny rra rrb rrc rrh rrn rrr ry- rya ryc ryn ryr ryy yaa yab yac yah yan yar yay ybc ybr yby yca ycc ych ycy yha yhc yna ynn yny yra yrc yrn yyb yyc yyy