-er a-a a-c a-t aaa aac aae aan aao aar aas aat ac- aca acc ace acn aco acr acs act aea aec aee aen aeo aer aes aet an- ana anc ane ann ano anr ans ant aoa aoc aoe aon aoo aor aos aot ar- ara arc are arn aro arr ars art as- asa asc ase asn aso asr ass ast at- ata atc ate atn ato atr ats att c-- caa cac cae can cao car cas cat cca ccc cce ccn cco ccr ccs cct ce- cea cec cee cen ceo cer ces cet cn- cna cnc cne cnn cno cnr cns cnt co- coa coc coe con coo cor cos cot cra crc cre crn cro crr crs crt csa csc cse csn cso csr css cst cta ctc cte ctn cto ctr cts ctt eaa eac eae ean eao ear eas eat ec- eca ecc ece ecn eco ecr ecs ect eea eec eee een eeo eer ees eet en- ena enc ene enn eno enr ens ent eo- eoa eoc eoe eon eoo eor eos eot era erc ere ern ero err ers ert es- esa esc ese esn eso esr ess est eta etc ete etn eto etr ets ett naa nac nae nan nao nar nas nat nca ncc nce ncn nco ncr ncs nct ne- nea nec nee nen neo ner nes net nna nnc nne nnn nno nns nnt no- noa noc noe non noo nor nos not nra nrc nre nrn nro nrr nrs nrt nsa nsc nse nsn nso nsr nss nst nta ntc nte ntn nto ntr nts ntt oaa oac oae oan oao oar oas oat oc- oca occ ocn oco ocr ocs oct oea oec oee oen oeo oer oes oet on- ona onc one onn ono onr ons ont oo- ooa ooc oon ooo oor oos oot or- ora orc ore orn oro orr ors ort os- osa osc ose osn oso osr oss ost ot- ota otc ote otn oto otr ots ott ra- raa rac rae ran rao rar ras rat rca rcc rce rcn rco rcr rcs rct re- rea rec ree ren reo rer res ret rna rnc rnn rno rnr rns rnt roa roc roe ron roo ror ros rot rra rrc rrn rrr rrs rrt rsa rsc rse rsn rso rsr rss rst rta rtc rte rtn rto rtr rts rtt saa sac sae san sao sar sas sat sca scc sce scn sco scr scs sct se- sea sec see sen seo ser ses set sna snc sne snn sno snr sns snt soa soc soe son soo sor sos sot sr- sra src sre srn sro srr srs srt ss- ssa ssc sse ssn sso ssr sss sst sta stc ste stn sto str sts stt taa tac tae tan tao tar tas tat tca tcc tce tcn tco tcr tcs tct te- tea tec tee ten teo ter tes tet tna tnc tne tnn tno tnr tns tnt to- toa toc toe ton too tor tos tot tra trc tre trn tro trr trs trt tsa tsc tse tsn tso tsr tss tst tta ttc tte ttn tto ttr tts ttt