-er a-a a-c aaa aac aae aan aar aas ac- aca acc ace acn acr acs aea aec aee aen aer aes an- ana anc ane ann anr ans ar- ara arc are arn arr ars as- asa asc ase asn asr ass c-- caa cac cae can car cas cca ccc cce ccn ccr ccs ce- cea cec cee cen cer ces cn- cna cnc cne cnn cnr cns cra crc cre crn crr crs csa csc cse csn csr css eaa eac eae ean ear eas ec- eca ecc ece ecn ecr ecs eea eec eee een eer ees en- ena enc ene enn enr ens era erc ere ern err ers es- esa esc ese esn esr ess naa nac nae nan nar nas nca ncc nce ncn ncr ncs ne- nea nec nee nen ner nes nna nnc nne nnn nns nra nrc nre nrn nrr nrs nsa nsc nse nsn nsr nss ra- raa rac rae ran rar ras rca rcc rce rcn rcr rcs re- rea rec ree ren rer res rna rnc rnn rnr rns rra rrc rrn rrr rrs rsa rsc rse rsn rsr rss saa sac sae san sar sas sca scc sce scn scr scs se- sea sec see sen ser ses sna snc sne snn snr sns sr- sra src sre srn srr srs ss- ssa ssc sse ssn ssr sss