-er -ic c-- ccc cce cci cco ccp ccr ccs ce- cec cee cei ceo cep cer ces ci- cic cie cii cio cip cir cis co- coc coe coi coo cop cor cos cpc cpe cpi cpo cpp cpr cps crc cre cri cro crp crr crs csc cse csi cso csp csr css ec- ecc ece eci eco ecr ecs eec eee eeo eep eer ees eic eie eii eio eip eir eis eo- eoc eoe eoi eoo eop eor eos ep- epc epe epi epo epp epr eps erc ere eri ero erp err ers es- esc ese esi eso esp esr ess icc ice ici ico icp icr ics ie- iec iee iei iep ier ies iic iie iii iio iip iir iis io- ioc ioe ioi ioo iop ior ios ipc ipe ipi ipo ipp ipr ips ir- irc ire iri iro irp irr irs is- isc ise isi iso isp isr iss o-i oc- occ oci oco ocp ocr ocs oec oee oei oeo oep oer oes oic oie oii oio oip oir ois oo- ooc ooi ooo oop oor oos op- opc ope opi opo opp opr ops or- orc ore ori oro orp orr ors os- osc ose osi oso osp osr oss p-p pcc pce pci pco pcp pcr pcs pec pee pei peo pep per pes pic pie pii pio pip pir pis poc poe poi poo pop por pos ppc ppe ppi ppo ppp ppr pps prc pre pri pro prp prr prs ps- psc pse psi pso psp psr pss rcc rce rci rco rcp rcr rcs re- rec ree rei reo rep rer res ric rie rii rio rip rir ris roc roe roi roo rop ror ros rpc rpe rpi rpo rpp rpr rps rrc rri rrp rrr rrs rsc rse rsi rso rsp rsr rss scc sce sci sco scp scr scs se- sec see sei seo sep ser ses sic sie sii sio sip sir sis soc soe soi soo sop sor sos spc spe spi spo spp spr sps sr- src sre sri sro srp srr srs ss- ssc sse ssi sso ssp ssr sss