-er -ic c-- ccc cce cci ccp ccr ccs ce- cec cee cei cep cer ces ci- cic cie cii cip cir cis cpc cpe cpi cpp cpr cps crc cre cri crp crr crs csc cse csi csp csr css ec- ecc ece eci ecr ecs eec eee eep eer ees eic eie eii eip eir eis ep- epc epe epi epp epr eps erc ere eri erp err ers es- esc ese esi esp esr ess icc ice ici icp icr ics ie- iec iee iei iep ier ies iic iie iii iip iir iis ipc ipe ipi ipp ipr ips ir- irc ire iri irp irr irs is- isc ise isi isp isr iss p-p pcc pce pci pcp pcr pcs pec pee pei pep per pes pic pie pii pip pir pis ppc ppe ppi ppp ppr pps prc pre pri prp prr prs ps- psc pse psi psp psr pss rcc rce rci rcp rcr rcs re- rec ree rei rep rer res ric rie rii rip rir ris rpc rpe rpi rpp rpr rps rrc rri rrp rrr rrs rsc rse rsi rsp rsr rss scc sce sci scp scr scs se- sec see sei sep ser ses sic sie sii sip sir sis spc spe spi spp spr sps sr- src sre sri srp srr srs ss- ssc sse ssi ssp ssr sss