-th a-a a-b a-c a-t aaa aab aac aah aar aat aay ab- aba abb abc abh abr abt aby ac- aca acb acc ach acr act acy aha ahb ahc ahh ahr aht ahy ar- ara arb arc arh arr art ary at- ata atb atc ath atr att ay- aya ayc ayh ayr ayt baa bab bac bah bar bat bay bba bbb bbc bbh bbr bbt bby bca bcb bcc bch bcr bct bcy bha bhb bhc bhh bhr bht bra brb brh brr brt bry bta btb btc bth btr btt bty by- bya byc byh byr byt c-- caa cab cac cah car cat cay cba cbb cbc cbh cbr cbt cby cca ccb ccc cch ccr cct ch- cha chb chc chh chr cht chy cra crb crc crh crr crt cry cta ctb ctc cth ctr ctt cty cya cyb cyc cyr cyt haa hab hac hah har hat hay hba hbb hbc hbh hbr hbt hby hca hcb hcc hch hcr hct hcy hha hhb hhc hhh hhr hht hhy hr- hra hrb hrc hrh hrr hrt hta htb htc hth htr htt hty hy- hya hyb hyc hyh hyr hyt hyy ra- raa rab rac rah rar rat ray rba rbb rbc rbh rbr rbt rca rcb rcc rch rcr rct rh- rha rhb rhc rhh rhr rht rra rrb rrc rrh rrr rrt rta rtb rtc rtr rtt rty ry- rya ryc ryr ryy taa tab tac tah tar tat tay tba tbb tbc tbh tbr tbt tca tcb tcc tch tcr tct th- tha thb thc thh thr tht thy tra trb trc trh trr trt try tta ttb ttc tth ttr ttt tty tya tyc tyr tyt yaa yab yac yah yar yat yay ybc ybr yby yca ycc ych ycy yha yhc yht yra yrc yrt yta ytc yth ytr ytt yyb yyc yyt yyy