-er -ic c-- ccc cce cci cck cco ccp ccr ccs ce- cec cee cei cek ceo cep cer ces ci- cic cie cii cik cio cip cir cis ckc cki cko cks co- coc coe coi cok coo cop cor cos cpc cpe cpi cpk cpo cpp cpr cps crc cre cri crk cro crp crr crs csc cse csi csk cso csp csr css ec- ecc ece eci eck eco ecr ecs eec eee eek eeo eep eer ees eic eie eii eik eio eip eir eis ekc eke eki eko ekp ekr eks eo- eoc eoe eoi eok eoo eop eor eos ep- epc epe epi epo epp epr eps erc ere eri erk ero erp err ers es- esc ese esi esk eso esp esr ess icc ice ici ick ico icp icr ics ie- iec iee iei iek iep ier ies iic iie iii iio iip iir iis ikc ike iki ikk iko ikr iks io- ioc ioe ioi ioo iop ior ios ipc ipe ipi ipo ipp ipr ips ir- irc ire iri irk iro irp irr irs is- isc ise isi isk iso isp isr iss kcc kce kci kck kcp kcr kcs ke- kec kee kei kek keo kep ker kes kic kie kii kik kio kip kir kis kkc kke kki kkk kkp kkr kks koc koe koi kok koo kop kor kos kpc kpe kpi kpk kpo kpp kpr kps krc kri krk kro krp krr krs ksc kse ksi ksk kso ksp ksr kss o-i oc- occ oci ock oco ocp ocr ocs oec oee oei oeo oep oer oes oic oie oii oik oio oip oir ois okc oke oki okk oko okp okr oks oo- ooc ooi ook ooo oop oor oos op- opc ope opi opk opo opp opr ops or- orc ore ori ork oro orp orr ors os- osc ose osi osk oso osp osr oss p-p pcc pce pci pck pco pcp pcr pcs pec pee pei pek peo pep per pes pic pie pii pik pio pip pir pis pkc pke pki pko pkp pkr pks poc poe poi pok poo pop por pos ppc ppe ppi ppk ppo ppp ppr pps prc pre pri prk pro prp prr prs ps- psc pse psi psk pso psp psr pss rcc rce rci rco rcp rcr rcs re- rec ree rei rek reo rep rer res ric rie rii rik rio rip rir ris rkc rke rkk rko rkp rks roc roe roi rok roo rop ror ros rpc rpe rpi rpk rpo rpp rpr rps rrc rri rrk rrp rrr rrs rsc rse rsi rsk rso rsp rsr rss scc sce sci sck sco scp scr scs se- sec see sei sek seo sep ser ses sic sie sii sik sio sip sir sis sk- skc ske ski skk sko skp skr sks soc soe soi sok soo sop sor sos spc spe spi spk spo spp spr sps sr- src sre sri srk sro srp srr srs ss- ssc sse ssi ssk sso ssp ssr sss