-th a-a a-c a-t aaa aac aah aao aar aat ac- aca acc ach aco acr act aha ahc ahh aho ahr aht aoa aoc aoh aoo aor aot ar- ara arc arh aro arr art at- ata atc ath ato atr att c-- caa cac cah cao car cat cca ccc cch cco ccr cct ch- cha chc chh cho chr cht co- coa coc coh coo cor cot cra crc crh cro crr crt cta ctc cth cto ctr ctt haa hac hah hao har hat hca hcc hch hco hcr hct hha hhc hhh hho hhr hht hoa hoc hoh hoo hor hot hr- hra hrc hrh hro hrr hrt hta htc hth hto htr htt oaa oac oah oao oar oat oc- oca occ och oco ocr oct oha ohc ohh oho ohr oht oo- ooa ooc ooh ooo oor oot or- ora orc orh oro orr ort ot- ota otc oth oto otr ott ra- raa rac rah rao rar rat rca rcc rch rco rcr rct rh- rha rhc rhh rho rhr rht roa roc roh roo ror rot rra rrc rrh rrr rrt rta rtc rto rtr rtt taa tac tah tao tar tat tca tcc tch tco tcr tct th- tha thc thh tho thr tht to- toa toc toh too tor tot tra trc trh tro trr trt tta ttc tth tto ttr ttt