-th a-a a-b a-t aaa aab aah aao aar aas aat ab- aba abb abh abo abr abs abt aha ahb ahh aho ahr ahs aht aoa aob aoh aoo aor aos aot ar- ara arb arh aro arr ars art as- asa asb ash aso asr ass ast at- ata atb ath ato atr ats att baa bab bah bao bar bas bat bba bbb bbh bbo bbr bbs bbt bha bhb bhh bho bhr bhs bht boa bob boh boo bor bos bot bra brb brh bro brr brs brt bsa bsb bsh bso bsr bss bst bta btb bth bto btr bts btt haa hab hah hao har has hat hba hbb hbh hbo hbr hbs hbt hha hhb hhh hho hhr hhs hht hoa hob hoh hoo hor hos hot hr- hra hrb hrh hro hrr hrs hrt hsa hsb hsh hsr hss hst hta htb hth hto htr hts htt oaa oab oah oao oar oas oat ob- oba obb obh obo obr obs obt oha ohh oho ohr ohs oht oo- ooa oob ooh ooo oor oos oot or- ora orb orh oro orr ors ort os- osa osb osh oso osr oss ost ot- ota otb oth oto otr ots ott ra- raa rab rah rao rar ras rat rba rbb rbh rbo rbr rbs rbt rh- rha rhb rhh rho rhr rhs rht roa rob roh roo ror ros rot rra rrb rrh rrr rrs rrt rsa rsb rsh rso rsr rss rst rta rtb rto rtr rts rtt saa sab sah sao sar sas sat sba sbb sbh sbo sbr sbs sbt sh- sha shb shh sho shr shs sht soa sob soh soo sor sos sot sr- sra srb srh sro srr srs srt ss- ssa ssb ssh sso ssr sss sst sta stb sth sto str sts stt taa tab tah tao tar tas tat tba tbb tbh tbo tbr tbs tbt th- tha thb thh tho thr ths tht to- toa tob toh too tor tos tot tra trb trh tro trr trs trt tsa tsb tsh tso tsr tss tst tta ttb tth tto ttr tts ttt