-er -ic c-- ccc cce cci cck ccp ccr ccs ce- cec cee cei cek cep cer ces ci- cic cie cii cik cip cir cis ckc cki cks cpc cpe cpi cpk cpp cpr cps crc cre cri crk crp crr crs csc cse csi csk csp csr css ec- ecc ece eci eck ecr ecs eec eee eek eep eer ees eic eie eii eik eip eir eis ekc eke eki ekp ekr eks ep- epc epe epi epp epr eps erc ere eri erk erp err ers es- esc ese esi esk esp esr ess icc ice ici ick icp icr ics ie- iec iee iei iek iep ier ies iic iie iii iip iir iis ikc ike iki ikk ikr iks ipc ipe ipi ipp ipr ips ir- irc ire iri irk irp irr irs is- isc ise isi isk isp isr iss kcc kce kci kck kcp kcr kcs ke- kec kee kei kek kep ker kes kic kie kii kik kip kir kis kkc kke kki kkk kkp kkr kks kpc kpe kpi kpk kpp kpr kps krc kri krk krp krr krs ksc kse ksi ksk ksp ksr kss p-p pcc pce pci pck pcp pcr pcs pec pee pei pek pep per pes pic pie pii pik pip pir pis pkc pke pki pkp pkr pks ppc ppe ppi ppk ppp ppr pps prc pre pri prk prp prr prs ps- psc pse psi psk psp psr pss rcc rce rci rcp rcr rcs re- rec ree rei rek rep rer res ric rie rii rik rip rir ris rkc rke rkk rkp rks rpc rpe rpi rpk rpp rpr rps rrc rri rrk rrp rrr rrs rsc rse rsi rsk rsp rsr rss scc sce sci sck scp scr scs se- sec see sei sek sep ser ses sic sie sii sik sip sir sis sk- skc ske ski skk skp skr sks spc spe spi spk spp spr sps sr- src sre sri srk srp srr srs ss- ssc sse ssi ssk ssp ssr sss