-th a-a a-b a-c a-t aaa aab aac aah aao aar aas aat ab- aba abb abc abh abo abr abs abt ac- aca acb acc ach aco acr acs act aha ahb ahc ahh aho ahr ahs aht aoa aob aoc aoh aoo aor aos aot ar- ara arb arc arh aro arr ars art as- asa asb asc ash aso asr ass ast at- ata atb atc ath ato atr ats att baa bab bac bah bao bar bas bat bba bbb bbc bbh bbo bbr bbs bbt bca bcb bcc bch bco bcr bcs bct bha bhb bhc bhh bho bhr bhs bht boa bob boc boh boo bor bos bot bra brb brh bro brr brs brt bsa bsb bsc bsh bso bsr bss bst bta btb btc bth bto btr bts btt c-- caa cab cac cah cao car cas cat cba cbb cbc cbh cbo cbr cbs cbt cca ccb ccc cch cco ccr ccs cct ch- cha chb chc chh cho chr chs cht co- coa cob coc coh coo cor cos cot cra crb crc crh cro crr crs crt csa csb csc csh cso csr css cst cta ctb ctc cth cto ctr cts ctt haa hab hac hah hao har has hat hba hbb hbc hbh hbo hbr hbs hbt hca hcb hcc hch hco hcr hcs hct hha hhb hhc hhh hho hhr hhs hht hoa hob hoc hoh hoo hor hos hot hr- hra hrb hrc hrh hro hrr hrs hrt hsa hsb hsc hsh hsr hss hst hta htb htc hth hto htr hts htt oaa oab oac oah oao oar oas oat ob- oba obb obc obh obo obr obs obt oc- oca ocb occ och oco ocr ocs oct oha ohc ohh oho ohr ohs oht oo- ooa oob ooc ooh ooo oor oos oot or- ora orb orc orh oro orr ors ort os- osa osb osc osh oso osr oss ost ot- ota otb otc oth oto otr ots ott ra- raa rab rac rah rao rar ras rat rba rbb rbc rbh rbo rbr rbs rbt rca rcb rcc rch rco rcr rcs rct rh- rha rhb rhc rhh rho rhr rhs rht roa rob roc roh roo ror ros rot rra rrb rrc rrh rrr rrs rrt rsa rsb rsc rsh rso rsr rss rst rta rtb rtc rto rtr rts rtt saa sab sac sah sao sar sas sat sba sbb sbc sbh sbo sbr sbs sbt sca scb scc sch sco scr scs sct sh- sha shb shc shh sho shr shs sht soa sob soc soh soo sor sos sot sr- sra srb src srh sro srr srs srt ss- ssa ssb ssc ssh sso ssr sss sst sta stb stc sth sto str sts stt taa tab tac tah tao tar tas tat tba tbb tbc tbh tbo tbr tbs tbt tca tcb tcc tch tco tcr tcs tct th- tha thb thc thh tho thr ths tht to- toa tob toc toh too tor tos tot tra trb trc trh tro trr trs trt tsa tsb tsc tsh tso tsr tss tst tta ttb ttc tth tto ttr tts ttt