-er -ic c-- ccc cce ccf cci cck cco ccp ccr ccs ce- cec cee cef cei cek ceo cep cer ces cfc cfe cff cfi cfk cfo cfp cfr cfs ci- cic cie cif cii cik cio cip cir cis ckc cki cko cks co- coc coe cof coi cok coo cop cor cos cpc cpe cpf cpi cpk cpo cpp cpr cps crc cre crf cri crk cro crp crr crs csc cse csf csi csk cso csp csr css ec- ecc ece ecf eci eck eco ecr ecs eec eee eef eek eeo eep eer ees ef- efc efe eff efi efo efp efr efs eic eie eif eii eik eio eip eir eis ekc eke ekf eki eko ekp ekr eks eo- eoc eoe eof eoi eok eoo eop eor eos ep- epc epe epf epi epo epp epr eps erc ere erf eri erk ero erp err ers es- esc ese esf esi esk eso esp esr ess fcc fce fcf fci fck fco fcp fcr fcs fec fee fef fei fek feo fep fer fes ffc ffe fff ffi ffk ffo ffp ffr ffs fic fie fif fii fik fip fir fis fkc fkf fki fkk fkp foc foe fof foi fok foo fop for fos fpc fpe fpi fpk fpo fpp fpr fps frc fre frf fri frk fro frp frr frs fsc fse fsf fsi fsk fso fsp fsr fss i-f icc ice icf ici ick ico icp icr ics ie- iec iee ief iei iek iep ier ies ifc ife iff ifi ifo ifp ifr ifs iic iie iif iii iio iip iir iis ikc ike ikf iki ikk iko ikr iks io- ioc ioe iof ioi ioo iop ior ios ipc ipe ipf ipi ipo ipp ipr ips ir- irc ire irf iri irk iro irp irr irs is- isc ise isf isi isk iso isp isr iss kcc kce kci kck kcp kcr kcs ke- kec kee kef kei kek keo kep ker kes kfc kff kfi kfo kfs kic kie kif kii kik kio kip kir kis kkc kke kki kkk kkp kkr kks koc koe kof koi kok koo kop kor kos kpc kpe kpf kpi kpk kpo kpp kpr kps krc krf kri krk kro krp krr krs ksc kse ksf ksi ksk kso ksp ksr kss o-i oc- occ ocf oci ock oco ocp ocr ocs oec oee oef oei oeo oep oer oes of- ofc ofe off ofi ofo ofp ofr ofs oic oie oif oii oik oio oip oir ois okc oke oki okk oko okp okr oks oo- ooc oof ooi ook ooo oop oor oos op- opc ope opf opi opk opo opp opr ops or- orc ore orf ori ork oro orp orr ors os- osc ose osf osi osk oso osp osr oss p-p pcc pce pcf pci pck pco pcp pcr pcs pec pee pef pei pek peo pep per pes pfc pfe pff pfi pfk pfo pfp pfr pfs pic pie pif pii pik pio pip pir pis pkc pke pkf pki pko pkp pkr pks poc poe pof poi pok poo pop por pos ppc ppe ppf ppi ppk ppo ppp ppr pps prc pre prf pri prk pro prp prr prs ps- psc pse psf psi psk pso psp psr pss rcc rce rcf rci rco rcp rcr rcs re- rec ree ref rei rek reo rep rer res rfc rfe rff rfi rfk rfo rfp rfr rfs ric rie rif rii rik rio rip rir ris rkc rke rkf rkk rko rkp rks roc roe rof roi rok roo rop ror ros rpc rpe rpf rpi rpk rpo rpp rpr rps rrc rrf rri rrk rrp rrr rrs rsc rse rsf rsi rsk rso rsp rsr rss scc sce scf sci sck sco scp scr scs se- sec see sef sei sek seo sep ser ses sfc sfe sff sfi sfk sfo sfp sfr sfs sic sie sif sii sik sio sip sir sis sk- skc ske skf ski skk sko skp skr sks soc soe sof soi sok soo sop sor sos spc spe spf spi spk spo spp spr sps sr- src sre srf sri srk sro srp srr srs ss- ssc sse ssf ssi ssk sso ssp ssr sss