-er -ic c-- ccc cce ccf cci cck ccp ccr ce- cec cee cef cei cek cep cer cfc cfe cff cfi cfk cfp cfr ci- cic cie cif cii cik cip cir ckc cki cpc cpe cpf cpi cpk cpp cpr crc cre crf cri crk crp crr ec- ecc ece ecf eci eck ecr eec eee eef eek eep eer ef- efc efe eff efi efp efr eic eie eif eii eik eip eir ekc eke ekf eki ekp ekr ep- epc epe epf epi epp epr erc ere erf eri erk erp err fcc fce fcf fci fck fcp fcr fec fee fef fei fek fep fer ffc ffe fff ffi ffk ffp ffr fic fie fif fii fik fip fir fkc fkf fki fkk fkp fpc fpe fpi fpk fpp fpr frc fre frf fri frk frp frr i-f icc ice icf ici ick icp icr ie- iec iee ief iei iek iep ier ifc ife iff ifi ifp ifr iic iie iif iii iip iir ikc ike ikf iki ikk ikr ipc ipe ipf ipi ipp ipr ir- irc ire irf iri irk irp irr kcc kce kci kck kcp kcr ke- kec kee kef kei kek kep ker kfc kff kfi kic kie kif kii kik kip kir kkc kke kki kkk kkp kkr kpc kpe kpf kpi kpk kpp kpr krc krf kri krk krp krr p-p pcc pce pcf pci pck pcp pcr pec pee pef pei pek pep per pfc pfe pff pfi pfk pfp pfr pic pie pif pii pik pip pir pkc pke pkf pki pkp pkr ppc ppe ppf ppi ppk ppp ppr prc pre prf pri prk prp prr rcc rce rcf rci rcp rcr re- rec ree ref rei rek rep rer rfc rfe rff rfi rfk rfp rfr ric rie rif rii rik rip rir rkc rke rkf rkk rkp rpc rpe rpf rpi rpk rpp rpr rrc rrf rri rrk rrp rrr