-er -ic c-- ccc cce ccf cci cck ccp ccr ccs ce- cec cee cef cei cek cep cer ces cfc cfe cff cfi cfk cfp cfr cfs ci- cic cie cif cii cik cip cir cis ckc cki cks cpc cpe cpf cpi cpk cpp cpr cps crc cre crf cri crk crp crr crs csc cse csf csi csk csp csr css ec- ecc ece ecf eci eck ecr ecs eec eee eef eek eep eer ees ef- efc efe eff efi efp efr efs eic eie eif eii eik eip eir eis ekc eke ekf eki ekp ekr eks ep- epc epe epf epi epp epr eps erc ere erf eri erk erp err ers es- esc ese esf esi esk esp esr ess fcc fce fcf fci fck fcp fcr fcs fec fee fef fei fek fep fer fes ffc ffe fff ffi ffk ffp ffr ffs fic fie fif fii fik fip fir fis fkc fkf fki fkk fkp fpc fpe fpi fpk fpp fpr fps frc fre frf fri frk frp frr frs fsc fse fsf fsi fsk fsp fsr fss i-f icc ice icf ici ick icp icr ics ie- iec iee ief iei iek iep ier ies ifc ife iff ifi ifp ifr ifs iic iie iif iii iip iir iis ikc ike ikf iki ikk ikr iks ipc ipe ipf ipi ipp ipr ips ir- irc ire irf iri irk irp irr irs is- isc ise isf isi isk isp isr iss kcc kce kci kck kcp kcr kcs ke- kec kee kef kei kek kep ker kes kfc kff kfi kfs kic kie kif kii kik kip kir kis kkc kke kki kkk kkp kkr kks kpc kpe kpf kpi kpk kpp kpr kps krc krf kri krk krp krr krs ksc kse ksf ksi ksk ksp ksr kss p-p pcc pce pcf pci pck pcp pcr pcs pec pee pef pei pek pep per pes pfc pfe pff pfi pfk pfp pfr pfs pic pie pif pii pik pip pir pis pkc pke pkf pki pkp pkr pks ppc ppe ppf ppi ppk ppp ppr pps prc pre prf pri prk prp prr prs ps- psc pse psf psi psk psp psr pss rcc rce rcf rci rcp rcr rcs re- rec ree ref rei rek rep rer res rfc rfe rff rfi rfk rfp rfr rfs ric rie rif rii rik rip rir ris rkc rke rkf rkk rkp rks rpc rpe rpf rpi rpk rpp rpr rps rrc rrf rri rrk rrp rrr rrs rsc rse rsf rsi rsk rsp rsr rss scc sce scf sci sck scp scr scs se- sec see sef sei sek sep ser ses sfc sfe sff sfi sfk sfp sfr sfs sic sie sif sii sik sip sir sis sk- skc ske skf ski skk skp skr sks spc spe spf spi spk spp spr sps sr- src sre srf sri srk srp srr srs ss- ssc sse ssf ssi ssk ssp ssr sss