-er a-a a-c a-t aaa aac aae aan aar aas aat ac- aca acc ace acn acr acs act aea aec aee aen aer aes aet an- ana anc ane ann anr ans ant ar- ara arc are arn arr ars art as- asa asc ase asn asr ass ast at- ata atc ate atn atr ats att c-- caa cac cae can car cas cat cca ccc cce ccn ccr ccs cct ce- cea cec cee cen cer ces cet cn- cna cnc cne cnn cnr cns cnt cra crc cre crn crr crs crt csa csc cse csn csr css cst cta ctc cte ctn ctr cts ctt eaa eac eae ean ear eas eat ec- eca ecc ece ecn ecr ecs ect eea eec eee een eer ees eet en- ena enc ene enn enr ens ent era erc ere ern err ers ert es- esa esc ese esn esr ess est eta etc ete etn etr ets ett naa nac nae nan nar nas nat nca ncc nce ncn ncr ncs nct ne- nea nec nee nen ner nes net nna nnc nne nnn nns nnt nra nrc nre nrn nrr nrs nrt nsa nsc nse nsn nsr nss nst nta ntc nte ntn ntr nts ntt ra- raa rac rae ran rar ras rat rca rcc rce rcn rcr rcs rct re- rea rec ree ren rer res ret rna rnc rnn rnr rns rnt rra rrc rrn rrr rrs rrt rsa rsc rse rsn rsr rss rst rta rtc rte rtn rtr rts rtt saa sac sae san sar sas sat sca scc sce scn scr scs sct se- sea sec see sen ser ses set sna snc sne snn snr sns snt sr- sra src sre srn srr srs srt ss- ssa ssc sse ssn ssr sss sst sta stc ste stn str sts stt taa tac tae tan tar tas tat tca tcc tce tcn tcr tcs tct te- tea tec tee ten ter tes tet tna tnc tne tnn tnr tns tnt tra trc tre trn trr trs trt tsa tsc tse tsn tsr tss tst tta ttc tte ttn ttr tts ttt