-er -th a-a a-c a-t aaa aac aae aah aar aas aat aax ac- aca acc ace ach acr acs act acx aea aec aee aeh aer aes aet aex aha ahc ahe ahh ahr ahs aht ahx ar- ara arc are arh arr ars art arx as- asa asc ase ash asr ass ast asx at- ata atc ate ath atr ats att atx ax- axa axe axh axr axs axt axx c-- caa cac cae cah car cas cat cax cca ccc cce cch ccr ccs cct ccx ce- cea cec cee ceh cer ces cet cex ch- cha chc che chh chr chs cht chx cra crc cre crh crr crs crt crx csa csc cse csh csr css cst csx cta ctc cte cth ctr cts ctt ctx cxc cxh cxr cxs cxt cxx eaa eac eae eah ear eas eat eax ec- eca ecc ece ech ecr ecs ect ecx eea eec eee eer ees eet eex eha ehc ehe ehh ehr ehs eht era erc ere erh err ers ert es- esa esc ese esh esr ess est esx eta etc ete eth etr ets ett etx ex- exa exc exe exh exr exs ext exx haa hac hae hah har has hat hax hca hcc hce hch hcr hcs hct he- hea hec hee heh her hes het hex hha hhc hhe hhh hhr hhs hht hr- hra hrc hre hrh hrr hrs hrt hsa hsc hse hsh hsr hss hst hsx hta htc hte hth htr hts htt htx hxc ra- raa rac rae rah rar ras rat rax rca rcc rce rch rcr rcs rct rcx re- rea rec ree reh rer res ret rex rh- rha rhc rhe rhh rhr rhs rht rra rrc rrh rrr rrs rrt rsa rsc rse rsh rsr rss rst rsx rta rtc rte rtr rts rtt rtx rxr rxs saa sac sae sah sar sas sat sax sca scc sce sch scr scs sct scx se- sea sec see seh ser ses set sex sh- sha shc she shh shr shs sht sr- sra src sre srh srr srs srt srx ss- ssa ssc sse ssh ssr sss sst ssx sta stc ste sth str sts stt stx sxc sxs sxt t-x taa tac tae tah tar tas tat tax tca tcc tce tch tcr tcs tct tcx te- tea tec tee teh ter tes tet tex th- tha thc the thh thr ths tht thx tra trc tre trh trr trs trt trx tsa tsc tse tsh tsr tss tst tsx tta ttc tte tth ttr tts ttt ttx txe txs txt xaa xac xar xas xat xch xcr xcx xee xer xes xet xex xht xrc xrt xrx xsa xsc xss xst xtc xtr xts xtx xxx