-er a-a a-c aaa aac aae aan aao aar aas ac- aca acc ace acn aco acr acs aea aec aee aen aeo aer aes an- ana anc ane ann ano anr ans aoa aoc aoe aon aoo aor aos ar- ara arc are arn aro arr ars as- asa asc ase asn aso asr ass c-- caa cac cae can cao car cas cca ccc cce ccn cco ccr ccs ce- cea cec cee cen ceo cer ces cn- cna cnc cne cnn cno cnr cns co- coa coc coe con coo cor cos cra crc cre crn cro crr crs csa csc cse csn cso csr css eaa eac eae ean eao ear eas ec- eca ecc ece ecn eco ecr ecs eea eec eee een eeo eer ees en- ena enc ene enn eno enr ens eo- eoa eoc eoe eon eoo eor eos era erc ere ern ero err ers es- esa esc ese esn eso esr ess naa nac nae nan nao nar nas nca ncc nce ncn nco ncr ncs ne- nea nec nee nen neo ner nes nna nnc nne nnn nno nns no- noa noc noe non noo nor nos nra nrc nre nrn nro nrr nrs nsa nsc nse nsn nso nsr nss oaa oac oae oan oao oar oas oc- oca occ ocn oco ocr ocs oea oec oee oen oeo oer oes on- ona onc one onn ono onr ons oo- ooa ooc oon ooo oor oos or- ora orc ore orn oro orr ors os- osa osc ose osn oso osr oss ra- raa rac rae ran rao rar ras rca rcc rce rcn rco rcr rcs re- rea rec ree ren reo rer res rna rnc rnn rno rnr rns roa roc roe ron roo ror ros rra rrc rrn rrr rrs rsa rsc rse rsn rso rsr rss saa sac sae san sao sar sas sca scc sce scn sco scr scs se- sea sec see sen seo ser ses sna snc sne snn sno snr sns soa soc soe son soo sor sos sr- sra src sre srn sro srr srs ss- ssa ssc sse ssn sso ssr sss