-er c-- ccc cce ccf ccn ccp ccr ccs ce- cec cee cef cen cep cer ces cfc cfe cff cfn cfp cfr cfs cn- cnc cne cnf cnn cnp cnr cns cpc cpe cpf cpn cpp cpr cps crc cre crf crn crp crr crs csc cse csf csn csp csr css ec- ecc ece ecf ecn ecr ecs eec eee eef een eep eer ees ef- efc efe eff efp efr efs en- enc ene enf enn enp enr ens ep- epc epe epf epn epp epr eps erc ere erf ern erp err ers es- esc ese esf esn esp esr ess fcc fce fcf fcn fcp fcr fcs fec fee fef fen fep fer fes ffc ffe fff ffn ffp ffr ffs fnc fne fnf fnn fnp fnr fns fpc fpe fpn fpp fpr fps frc fre frf frn frp frr frs fsc fse fsf fsn fsp fsr fss ncc nce ncf ncn ncp ncr ncs ne- nec nee nef nen nep ner nes nfc nfe nff nfn nfp nfr nfs nnc nne nnf nnn nnp nns npc npe npf npn npp npr nps nrc nre nrf nrn nrp nrr nrs nsc nse nsf nsn nsp nsr nss p-p pcc pce pcf pcn pcp pcr pcs pec pee pef pen pep per pes pfc pfe pff pfn pfp pfr pfs pn- pnc pne pnf pnn pnp pnr pns ppc ppe ppf ppn ppp ppr pps prc pre prf prn prp prr prs ps- psc pse psf psn psp psr pss rcc rce rcf rcn rcp rcr rcs re- rec ree ref ren rep rer res rfc rfe rff rfn rfp rfr rfs rnc rnn rnp rnr rns rpc rpe rpf rpn rpp rpr rps rrc rrf rrn rrp rrr rrs rsc rse rsf rsn rsp rsr rss scc sce scf scn scp scr scs se- sec see sef sen sep ser ses sfc sfe sff sfn sfp sfr sfs snc sne snf snn snp snr sns spc spe spf spn spp spr sps sr- src sre srf srn srp srr srs ss- ssc sse ssf ssn ssp ssr sss