-th a-a a-b a-c a-t aaa aab aac aah aak aar aas aat ab- aba abb abc abh abk abr abs abt ac- aca acb acc ach ack acr acs act aha ahb ahc ahh ahk ahr ahs aht aka akb akc akh akk akr aks ar- ara arb arc arh ark arr ars art as- asa asb asc ash ask asr ass ast at- ata atb atc ath atr ats att baa bab bac bah bak bar bas bat bba bbb bbc bbh bbk bbr bbs bbt bca bcb bcc bch bck bcr bcs bct bha bhb bhc bhh bhk bhr bhs bht bka bkb bkc bkk bkr bks bkt bra brb brh brk brr brs brt bsa bsb bsc bsh bsk bsr bss bst bta btb btc bth btk btr bts btt c-- caa cab cac cah cak car cas cat cba cbb cbc cbh cbk cbr cbs cbt cca ccb ccc cch cck ccr ccs cct ch- cha chb chc chh chk chr chs cht cka ckb ckc ckh cks ckt cra crb crc crh crk crr crs crt csa csb csc csh csk csr css cst cta ctb ctc cth ctk ctr cts ctt haa hab hac hah hak har has hat hba hbb hbc hbh hbk hbr hbs hbt hca hcb hcc hch hck hcr hcs hct hha hhb hhc hhh hhk hhr hhs hht hka hkb hkh hkk hkr hks hkt hr- hra hrb hrc hrh hrk hrr hrs hrt hsa hsb hsc hsh hsk hsr hss hst hta htb htc hth htk htr hts htt k-t ka- kaa kab kac kah kak kar kas kat kba kbb kbc kbh kbk kbr kbs kca kcb kcc kch kck kcr kcs kct kha khh khk khr khs kkb kkc kkh kkk kkr kks kkt kra krc krk krr krs krt ksa ksb ksc ksh ksk ksr kss kst kta ktb ktc kth ktk ktr kts ktt ra- raa rab rac rah rak rar ras rat rba rbb rbc rbh rbk rbr rbs rbt rca rcb rcc rch rcr rcs rct rh- rha rhb rhc rhh rhr rhs rht rkb rkc rkk rks rkt rra rrb rrc rrh rrk rrr rrs rrt rsa rsb rsc rsh rsk rsr rss rst rta rtb rtc rtk rtr rts rtt saa sab sac sah sak sar sas sat sba sbb sbc sbh sbk sbr sbs sbt sca scb scc sch sck scr scs sct sh- sha shb shc shh shk shr shs sht sk- ska skb skc skh skk skr sks skt sr- sra srb src srh srk srr srs srt ss- ssa ssb ssc ssh ssk ssr sss sst sta stb stc sth stk str sts stt taa tab tac tah tak tar tas tat tba tbb tbc tbh tbk tbr tbs tbt tca tcb tcc tch tck tcr tcs tct th- tha thb thc thh thk thr ths tht tka tkb tkc tkk tkr tks tkt tra trb trc trh trk trr trs trt tsa tsb tsc tsh tsk tsr tss tst tta ttb ttc tth ttk ttr tts ttt