-er -th a-a a-c a-t aaa aac aae aah aar aat aax ac- aca acc ace ach acr act acx aea aec aee aeh aer aet aex aha ahc ahe ahh ahr aht ahx ar- ara arc are arh arr art arx at- ata atc ate ath atr att atx ax- axa axe axh axr axt axx c-- caa cac cae cah car cat cax cca ccc cce cch ccr cct ccx ce- cea cec cee ceh cer cet cex ch- cha chc che chh chr cht chx cra crc cre crh crr crt crx cta ctc cte cth ctr ctt ctx cxc cxh cxr cxt cxx eaa eac eae eah ear eat eax ec- eca ecc ece ech ecr ect ecx eea eec eee eer eet eex eha ehc ehe ehh ehr eht era erc ere erh err ert eta etc ete eth etr ett etx ex- exa exc exe exh exr ext exx haa hac hae hah har hat hax hca hcc hce hch hcr hct he- hea hec hee heh her het hex hha hhc hhe hhh hhr hht hr- hra hrc hre hrh hrr hrt hta htc hte hth htr htt htx hxc ra- raa rac rae rah rar rat rax rca rcc rce rch rcr rct rcx re- rea rec ree reh rer ret rex rh- rha rhc rhe rhh rhr rht rra rrc rrh rrr rrt rta rtc rte rtr rtt rtx rxr t-x taa tac tae tah tar tat tax tca tcc tce tch tcr tct tcx te- tea tec tee teh ter tet tex th- tha thc the thh thr tht thx tra trc tre trh trr trt trx tta ttc tte tth ttr ttt ttx txe txt xaa xac xar xat xch xcr xcx xee xer xet xex xht xrc xrt xrx xtc xtr xtx xxx