-th a-a a-b a-c a-t aaa aab aac aah aao aar aat ab- aba abb abc abh abo abr abt ac- aca acb acc ach aco acr act aha ahb ahc ahh aho ahr aht aoa aob aoc aoh aoo aor aot ar- ara arb arc arh aro arr art at- ata atb atc ath ato atr att baa bab bac bah bao bar bat bba bbb bbc bbh bbo bbr bbt bca bcb bcc bch bco bcr bct bha bhb bhc bhh bho bhr bht boa bob boc boh boo bor bot bra brb brh bro brr brt bta btb btc bth bto btr btt c-- caa cab cac cah cao car cat cba cbb cbc cbh cbo cbr cbt cca ccb ccc cch cco ccr cct ch- cha chb chc chh cho chr cht co- coa cob coc coh coo cor cot cra crb crc crh cro crr crt cta ctb ctc cth cto ctr ctt haa hab hac hah hao har hat hba hbb hbc hbh hbo hbr hbt hca hcb hcc hch hco hcr hct hha hhb hhc hhh hho hhr hht hoa hob hoc hoh hoo hor hot hr- hra hrb hrc hrh hro hrr hrt hta htb htc hth hto htr htt oaa oab oac oah oao oar oat ob- oba obb obc obh obo obr obt oc- oca ocb occ och oco ocr oct oha ohc ohh oho ohr oht oo- ooa oob ooc ooh ooo oor oot or- ora orb orc orh oro orr ort ot- ota otb otc oth oto otr ott ra- raa rab rac rah rao rar rat rba rbb rbc rbh rbo rbr rbt rca rcb rcc rch rco rcr rct rh- rha rhb rhc rhh rho rhr rht roa rob roc roh roo ror rot rra rrb rrc rrh rrr rrt rta rtb rtc rto rtr rtt taa tab tac tah tao tar tat tba tbb tbc tbh tbo tbr tbt tca tcb tcc tch tco tcr tct th- tha thb thc thh tho thr tht to- toa tob toc toh too tor tot tra trb trc trh tro trr trt tta ttb ttc tth tto ttr ttt