-th a-a a-c a-t aaa aac aae aah aas aat aax ac- aca acc ace ach acs act acx aea aec aee aeh aes aet aex aha ahc ahe ahh ahs aht ahx as- asa asc ase ash ass ast asx at- ata atc ate ath ats att atx ax- axa axe axh axs axt axx c-- caa cac cae cah cas cat cax cca ccc cce cch ccs cct ccx ce- cea cec cee ceh ces cet cex ch- cha chc che chh chs cht chx csa csc cse csh css cst csx cta ctc cte cth cts ctt ctx cxc cxh cxs cxt cxx eaa eac eae eah eas eat eax ec- eca ecc ece ech ecs ect ecx eea eec eee ees eet eex eha ehc ehe ehh ehs eht es- esa esc ese esh ess est esx eta etc ete eth ets ett etx ex- exa exc exe exh exs ext exx haa hac hae hah has hat hax hca hcc hce hch hcs hct he- hea hec hee heh hes het hex hha hhc hhe hhh hhs hht hsa hsc hse hsh hss hst hsx hta htc hte hth hts htt htx hxc saa sac sae sah sas sat sax sca scc sce sch scs sct scx se- sea sec see seh ses set sex sh- sha shc she shh shs sht ss- ssa ssc sse ssh sss sst ssx sta stc ste sth sts stt stx sxc sxs sxt t-x taa tac tae tah tas tat tax tca tcc tce tch tcs tct tcx te- tea tec tee teh tes tet tex th- tha thc the thh ths tht thx tsa tsc tse tsh tss tst tsx tta ttc tte tth tts ttt ttx txe txs txt xaa xac xas xat xch xcx xee xes xet xex xht xsa xsc xss xst xtc xts xtx xxx