-er c-- ccc cce ccn ccr ccs ccv ce- cec cee cen cer ces cev cn- cnc cne cnn cnr cns cnv crc cre crn crr crs crv csc cse csn csr css csv cvc cve cvn cvr cvs cvv ec- ecc ece ecn ecr ecs ecv eec eee een eer ees eev en- enc ene enn enr ens env erc ere ern err ers erv es- esc ese esn esr ess esv evc eve evn evr evs evv ncc nce ncn ncr ncs ncv ne- nec nee nen ner nes nev nnc nne nnn nns nnv nrc nre nrn nrr nrs nrv nsc nse nsn nsr nss nsv nvc nve nvn nvv rcc rce rcn rcr rcs rcv re- rec ree ren rer res rev rnc rnn rnr rns rnv rrc rrn rrr rrs rsc rse rsn rsr rss rsv rvc rve rvn rvr rvs rvv scc sce scn scr scs scv se- sec see sen ser ses sev snc sne snn snr sns snv sr- src sre srn srr srs srv ss- ssc sse ssn ssr sss ssv svc sve svn svr svs svv v-e vcc vce vcn vcr vcs vec vee ven ver ves vn- vnr vns vnv vrc vre vrn vrr vrs vsc vse vsn vsr vss vsv vvc vvr vvs vvv