-er -ic c-- ccc cce cci cck ccm cco ccr ce- cec cee cei cek cem ceo cer ci- cic cie cii cik cim cio cir ckc cki ckm cko cmc cme cmi cmk cmm cmo cmr co- coc coe coi cok com coo cor crc cre cri crk crm cro crr ec- ecc ece eci eck ecm eco ecr eec eee eek eem eeo eer eic eie eii eik eim eio eir ekc eke eki eko ekr em- emc eme emi emk emm emo emr eo- eoc eoe eoi eok eom eoo eor erc ere eri erk erm ero err icc ice ici ick icm ico icr ie- iec iee iei iek iem ier iic iie iii iim iio iir ikc ike iki ikk iko ikr im- imc ime imi imm imo io- ioc ioe ioi iom ioo ior ir- irc ire iri irk irm iro irr kcc kce kci kck kcm kcr ke- kec kee kei kek kem keo ker kic kie kii kik kim kio kir kkc kke kki kkk kkm kkr kmc kme kmi kmk kmm kmo koc koe koi kok kom koo kor krc kri krk kro krr m-o m-r mc- mcc mce mci mck mcm mco mcr mec mee mei mek mem meo mer mi- mic mie mii mik mim mio mir mkc mke mkk mkm mko mkr mmc mme mmi mmk mmm mmo mmr moc moe moi mok mom moo mor mrc mre mri mrk mrm mro mrr o-i oc- occ oci ock ocm oco ocr oec oee oei oem oeo oer oic oie oii oik oim oio oir okc oke oki okk oko okr om- omc ome omi omm omo omr oo- ooc ooi ook oom ooo oor or- orc ore ori ork orm oro orr rcc rce rci rcm rco rcr re- rec ree rei rek rem reo rer ric rie rii rik rim rio rir rkc rke rkk rkm rko rmc rme rmi rmm rmo rmr roc roe roi rok rom roo ror rrc rri rrk rrm rrr