-er a-a a-c aaa aac aae aag aan aap aar aas ac- aca acc ace acg acn acp acr acs aea aec aee aeg aen aep aer aes ag- aga agc age agg agn agp agr ags an- ana anc ane ang ann anp anr ans ap- apa apc ape apg apn app apr aps ar- ara arc are arg arn arp arr ars as- asa asc ase asg asn asp asr ass c-- caa cac cae cag can cap car cas cca ccc cce ccg ccn ccp ccr ccs ce- cea cec cee ceg cen cep cer ces cga cgc cge cgg cgn cgp cgr cgs cn- cna cnc cne cng cnn cnp cnr cns cpa cpc cpe cpg cpn cpp cpr cps cra crc cre crg crn crp crr crs csa csc cse csg csn csp csr css eaa eac eae eag ean eap ear eas ec- eca ecc ece ecg ecn ecr ecs eea eec eee eeg een eep eer ees ega egc ege egg egn egp egr egs en- ena enc ene eng enn enp enr ens ep- epa epc epe epg epn epp epr eps era erc ere erg ern erp err ers es- esa esc ese esg esn esp esr ess g-p gaa gac gae gag gan gap gar gas gca gcc gce gcg gcn gcp gcr gcs ge- gea gec gee geg gen gep ger ges gga ggc ggg ggn ggp ggr ggs gna gnc gne gnn gnp gnr gns gpa gpc gpe gpg gpn gpp gpr gps gra grc gre grg grn grp grr grs gsa gsc gse gsg gsn gsp gsr gss naa nac nae nag nan nap nar nas nca ncc nce ncg ncn ncp ncr ncs ne- nea nec nee neg nen nep ner nes nga ngc nge ngg ngn ngp ngs nna nnc nne nng nnn nnp nns npa npc npe npg npn npp npr nps nra nrc nre nrg nrn nrp nrr nrs nsa nsc nse nsg nsn nsp nsr nss p-p paa pac pae pag pan pap par pas pca pcc pce pcg pcn pcp pcr pcs pea pec pee peg pen pep per pes pga pgc pge pgg pgn pgp pgr pgs pn- pna pnc pne png pnn pnp pnr pns ppa ppc ppe ppg ppn ppp ppr pps pra prc pre prg prn prp prr prs ps- psa psc pse psg psn psp psr pss ra- raa rac rae rag ran rap rar ras rca rcc rce rcg rcn rcp rcr rcs re- rea rec ree reg ren rep rer res rga rgc rge rgg rgn rgp rgr rgs rna rnc rng rnn rnp rnr rns rpa rpc rpe rpg rpn rpp rpr rps rra rrc rrg rrn rrp rrr rrs rsa rsc rse rsg rsn rsp rsr rss saa sac sae sag san sap sar sas sca scc sce scg scn scp scr scs se- sea sec see seg sen sep ser ses sga sgc sge sgg sgn sgp sgr sgs sna snc sne sng snn snp snr sns spa spc spe spg spn spp spr sps sr- sra src sre srg srn srp srr srs ss- ssa ssc sse ssg ssn ssp ssr sss