-er a-a a-c a-t aaa aac aae aar aas aat aau aax ac- aca acc ace acr acs act acu acx aea aec aee aer aes aet aeu aex ar- ara arc are arr ars art aru arx as- asa asc ase asr ass ast asu asx at- ata atc ate atr ats att atu atx au- aua auc aue aur aus aut aux ax- axa axe axr axs axt axx c-- caa cac cae car cas cat cau cax cca ccc cce ccr ccs cct ccu ccx ce- cea cec cee cer ces cet ceu cex cra crc cre crr crs crt cru crx csa csc cse csr css cst csu csx cta ctc cte ctr cts ctt ctu ctx cua cuc cue cur cus cut cuu cxc cxr cxs cxt cxx eaa eac eae ear eas eat eau eax ec- eca ecc ece ecr ecs ect ecu ecx eea eec eee eer ees eet eex era erc ere err ers ert eru es- esa esc ese esr ess est esu esx eta etc ete etr ets ett etu etx eu- eua euc eue eur eus eut eux ex- exa exc exe exr exs ext exu exx ra- raa rac rae rar ras rat rau rax rca rcc rce rcr rcs rct rcu rcx re- rea rec ree rer res ret reu rex rra rrc rrr rrs rrt rru rsa rsc rse rsr rss rst rsu rsx rta rtc rte rtr rts rtt rtu rtx rua ruc rue rur rus rut ruu rux rxr rxs saa sac sae sar sas sat sau sax sca scc sce scr scs sct scu scx se- sea sec see ser ses set seu sex sr- sra src sre srr srs srt srx ss- ssa ssc sse ssr sss sst ssu ssx sta stc ste str sts stt stu stx sua suc sue sur sus sut suu sux sxc sxs sxt sxu t-x taa tac tae tar tas tat tau tax tca tcc tce tcr tcs tct tcu tcx te- tea tec tee ter tes tet teu tex tra trc tre trr trs trt tru trx tsa tsc tse tsr tss tst tsu tsx tta ttc tte ttr tts ttt ttu ttx tua tuc tue tur tus tut tuu tux txe txs txt txu ua- uaa uac uae uar uas uat uau uca ucc uce ucr ucs uct ucu uea uec uee uer ues uet ur- ura urc ure urr urs urt uru urx usa usc use usr uss ust usu usx uta utc ute utr uts utt utu utx uua uuc uue uur uus uut uuu uxc uxr uxt uxu xaa xac xar xas xat xau xcr xcx xee xer xes xet xeu xex xrc xrt xrx xsa xsc xss xst xtc xtr xts xtx xue xus xxx