-er -ic c-- ccc cce cci cck cco ccp ccr ce- cec cee cei cek ceo cep cer ci- cic cie cii cik cio cip cir ckc cki cko co- coc coe coi cok coo cop cor cpc cpe cpi cpk cpo cpp cpr crc cre cri crk cro crp crr ec- ecc ece eci eck eco ecr eec eee eek eeo eep eer eic eie eii eik eio eip eir ekc eke eki eko ekp ekr eo- eoc eoe eoi eok eoo eop eor ep- epc epe epi epo epp epr erc ere eri erk ero erp err icc ice ici ick ico icp icr ie- iec iee iei iek iep ier iic iie iii iio iip iir ikc ike iki ikk iko ikr io- ioc ioe ioi ioo iop ior ipc ipe ipi ipo ipp ipr ir- irc ire iri irk iro irp irr kcc kce kci kck kcp kcr ke- kec kee kei kek keo kep ker kic kie kii kik kio kip kir kkc kke kki kkk kkp kkr koc koe koi kok koo kop kor kpc kpe kpi kpk kpo kpp kpr krc kri krk kro krp krr o-i oc- occ oci ock oco ocp ocr oec oee oei oeo oep oer oic oie oii oik oio oip oir okc oke oki okk oko okp okr oo- ooc ooi ook ooo oop oor op- opc ope opi opk opo opp opr or- orc ore ori ork oro orp orr p-p pcc pce pci pck pco pcp pcr pec pee pei pek peo pep per pic pie pii pik pio pip pir pkc pke pki pko pkp pkr poc poe poi pok poo pop por ppc ppe ppi ppk ppo ppp ppr prc pre pri prk pro prp prr rcc rce rci rco rcp rcr re- rec ree rei rek reo rep rer ric rie rii rik rio rip rir rkc rke rkk rko rkp roc roe roi rok roo rop ror rpc rpe rpi rpk rpo rpp rpr rrc rri rrk rrp rrr