-er c-- ccc cce ccg ccn ccr ccs ce- cec cee ceg cen cer ces cgc cge cgg cgn cgr cgs cn- cnc cne cng cnn cnr cns crc cre crg crn crr crs csc cse csg csn csr css ec- ecc ece ecg ecn ecr ecs eec eee eeg een eer ees egc ege egg egn egr egs en- enc ene eng enn enr ens erc ere erg ern err ers es- esc ese esg esn esr ess gcc gce gcg gcn gcr gcs ge- gec gee geg gen ger ges ggc ggg ggn ggr ggs gnc gne gnn gnr gns grc gre grg grn grr grs gsc gse gsg gsn gsr gss ncc nce ncg ncn ncr ncs ne- nec nee neg nen ner nes ngc nge ngg ngn ngs nnc nne nng nnn nns nrc nre nrg nrn nrr nrs nsc nse nsg nsn nsr nss rcc rce rcg rcn rcr rcs re- rec ree reg ren rer res rgc rge rgg rgn rgr rgs rnc rng rnn rnr rns rrc rrg rrn rrr rrs rsc rse rsg rsn rsr rss scc sce scg scn scr scs se- sec see seg sen ser ses sgc sge sgg sgn sgr sgs snc sne sng snn snr sns sr- src sre srg srn srr srs ss- ssc sse ssg ssn ssr sss