-er a-a a-c a-t aaa aac aae aao aar aas aat aau aax ac- aca acc ace aco acr acs act acu acx aea aec aee aeo aer aes aet aeu aex aoa aoc aoe aoo aor aos aot aou aox ar- ara arc are aro arr ars art aru arx as- asa asc ase aso asr ass ast asu asx at- ata atc ate ato atr ats att atu atx au- aua auc aue auo aur aus aut aux ax- axa axe axo axr axs axt axx c-- caa cac cae cao car cas cat cau cax cca ccc cce cco ccr ccs cct ccu ccx ce- cea cec cee ceo cer ces cet ceu cex co- coa coc coe coo cor cos cot cou cox cra crc cre cro crr crs crt cru crx csa csc cse cso csr css cst csu csx cta ctc cte cto ctr cts ctt ctu ctx cua cuc cue cuo cur cus cut cuu cxc cxo cxr cxs cxt cxx eaa eac eae eao ear eas eat eau eax ec- eca ecc ece eco ecr ecs ect ecu ecx eea eec eee eeo eer ees eet eex eo- eoa eoc eoe eoo eor eos eot eou era erc ere ero err ers ert eru es- esa esc ese eso esr ess est esu esx eta etc ete eto etr ets ett etu etx eu- eua euc eue eur eus eut eux ex- exa exc exe exo exr exs ext exu exx oaa oac oae oao oar oas oat oau oax oc- oca occ oco ocr ocs oct ocu ocx oea oec oee oeo oer oes oet oex oo- ooa ooc ooo oor oos oot oox or- ora orc ore oro orr ors ort oru orx os- osa osc ose oso osr oss ost osu osx ot- ota otc ote oto otr ots ott otu ou- oua ouc oue ouo our ous out ox- oxa oxc oxo oxt oxx ra- raa rac rae rao rar ras rat rau rax rca rcc rce rco rcr rcs rct rcu rcx re- rea rec ree reo rer res ret reu rex roa roc roe roo ror ros rot rou rox rra rrc rrr rrs rrt rru rsa rsc rse rso rsr rss rst rsu rsx rta rtc rte rto rtr rts rtt rtu rtx rua ruc rue ruo rur rus rut ruu rux rxr rxs saa sac sae sao sar sas sat sau sax sca scc sce sco scr scs sct scu scx se- sea sec see seo ser ses set seu sex soa soc soe soo sor sos sot sou sox sr- sra src sre sro srr srs srt srx ss- ssa ssc sse sso ssr sss sst ssu ssx sta stc ste sto str sts stt stu stx sua suc sue suo sur sus sut suu sux sxc sxs sxt sxu t-x taa tac tae tao tar tas tat tau tax tca tcc tce tco tcr tcs tct tcu tcx te- tea tec tee teo ter tes tet teu tex to- toa toc toe too tor tos tot tou tox tra trc tre tro trr trs trt tru trx tsa tsc tse tso tsr tss tst tsu tsx tta ttc tte tto ttr tts ttt ttu ttx tua tuc tue tuo tur tus tut tuu tux txe txs txt txu ua- uaa uac uae uao uar uas uat uau uca ucc uce uco ucr ucs uct ucu uea uec uee uer ues uet uoa uoc uoe uoo uor uos uot uox ur- ura urc ure uro urr urs urt uru urx usa usc use uso usr uss ust usu usx uta utc ute uto utr uts utt utu utx uua uuc uue uur uus uut uuu uxc uxo uxr uxt uxu xaa xac xar xas xat xau xcr xcx xee xer xes xet xeu xex xoa xoc xoo xor xos xot xox xrc xrt xrx xsa xsc xss xst xtc xtr xts xtx xue xus xxo xxx