-er c-- ccc cce cck ccm ccp ccr ccs ce- cec cee cek cem cep cer ces ckc ckm cks cmc cme cmk cmm cmp cmr cms cpc cpe cpk cpm cpp cpr cps crc cre crk crm crp crr crs csc cse csk csm csp csr css ec- ecc ece eck ecm ecr ecs eec eee eek eem eep eer ees ekc eke ekp ekr eks em- emc eme emk emm emp emr ems ep- epc epe epm epp epr eps erc ere erk erm erp err ers es- esc ese esk esm esp esr ess kcc kce kck kcm kcp kcr kcs ke- kec kee kek kem kep ker kes kkc kke kkk kkm kkp kkr kks kmc kme kmk kmm kmp kms kpc kpe kpk kpm kpp kpr kps krc krk krp krr krs ksc kse ksk ksm ksp ksr kss m-r mc- mcc mce mck mcm mcp mcr mcs mec mee mek mem mep mer mes mkc mke mkk mkm mkp mkr mks mmc mme mmk mmm mmp mmr mms mpc mpe mpk mpm mpp mpr mps mrc mre mrk mrm mrp mrr mrs msc mse msk msm msp msr mss p-p pcc pce pck pcm pcp pcr pcs pec pee pek pem pep per pes pkc pke pkm pkp pkr pks pmc pme pmk pmm pmp pmr pms ppc ppe ppk ppm ppp ppr pps prc pre prk prm prp prr prs ps- psc pse psk psm psp psr pss rcc rce rcm rcp rcr rcs re- rec ree rek rem rep rer res rkc rke rkk rkm rkp rks rmc rme rmm rmp rmr rms rpc rpe rpk rpm rpp rpr rps rrc rrk rrm rrp rrr rrs rsc rse rsk rsm rsp rsr rss scc sce sck scm scp scr scs se- sec see sek sem sep ser ses sk- skc ske skk skm skp skr sks smc sme smk smm smp smr sms spc spe spk spm spp spr sps sr- src sre srk srm srp srr srs ss- ssc sse ssk ssm ssp ssr sss