-th a-a a-c a-t aaa aac aah aao aar aat aax ac- aca acc ach aco acr act acx aha ahc ahh aho ahr aht ahx aoa aoc aoh aoo aor aot aox ar- ara arc arh aro arr art arx at- ata atc ath ato atr att atx ax- axa axh axo axr axt axx c-- caa cac cah cao car cat cax cca ccc cch cco ccr cct ccx ch- cha chc chh cho chr cht chx co- coa coc coh coo cor cot cox cra crc crh cro crr crt crx cta ctc cth cto ctr ctt ctx cxc cxh cxo cxr cxt cxx haa hac hah hao har hat hax hca hcc hch hco hcr hct hha hhc hhh hho hhr hht hoa hoc hoh hoo hor hot hox hr- hra hrc hrh hro hrr hrt hta htc hth hto htr htt htx hxc oaa oac oah oao oar oat oax oc- oca occ och oco ocr oct ocx oha ohc ohh oho ohr oht oo- ooa ooc ooh ooo oor oot oox or- ora orc orh oro orr ort orx ot- ota otc oth oto otr ott ox- oxa oxc oxo oxt oxx ra- raa rac rah rao rar rat rax rca rcc rch rco rcr rct rcx rh- rha rhc rhh rho rhr rht roa roc roh roo ror rot rox rra rrc rrh rrr rrt rta rtc rto rtr rtt rtx rxr t-x taa tac tah tao tar tat tax tca tcc tch tco tcr tct tcx th- tha thc thh tho thr tht thx to- toa toc toh too tor tot tox tra trc trh tro trr trt trx tta ttc tth tto ttr ttt ttx txt xaa xac xar xat xch xcr xcx xht xoa xoc xoo xor xot xox xrc xrt xrx xtc xtr xtx xxo xxx