-er -ic c-- ccc cce cci cck ccm cco ccr ccs ce- cec cee cei cek cem ceo cer ces ci- cic cie cii cik cim cio cir cis ckc cki ckm cko cks cmc cme cmi cmk cmm cmo cmr cms co- coc coe coi cok com coo cor cos crc cre cri crk crm cro crr crs csc cse csi csk csm cso csr css ec- ecc ece eci eck ecm eco ecr ecs eec eee eek eem eeo eer ees eic eie eii eik eim eio eir eis ekc eke eki eko ekr eks em- emc eme emi emk emm emo emr ems eo- eoc eoe eoi eok eom eoo eor eos erc ere eri erk erm ero err ers es- esc ese esi esk esm eso esr ess icc ice ici ick icm ico icr ics ie- iec iee iei iek iem ier ies iic iie iii iim iio iir iis ikc ike iki ikk iko ikr iks im- imc ime imi imm imo ims io- ioc ioe ioi iom ioo ior ios ir- irc ire iri irk irm iro irr irs is- isc ise isi isk ism iso isr iss kcc kce kci kck kcm kcr kcs ke- kec kee kei kek kem keo ker kes kic kie kii kik kim kio kir kis kkc kke kki kkk kkm kkr kks kmc kme kmi kmk kmm kmo kms koc koe koi kok kom koo kor kos krc kri krk kro krr krs ksc kse ksi ksk ksm kso ksr kss m-o m-r mc- mcc mce mci mck mcm mco mcr mcs mec mee mei mek mem meo mer mes mi- mic mie mii mik mim mio mir mis mkc mke mkk mkm mko mkr mks mmc mme mmi mmk mmm mmo mmr mms moc moe moi mok mom moo mor mos mrc mre mri mrk mrm mro mrr mrs msc mse msi msk msm mso msr mss o-i oc- occ oci ock ocm oco ocr ocs oec oee oei oem oeo oer oes oic oie oii oik oim oio oir ois okc oke oki okk oko okr oks om- omc ome omi omm omo omr oms oo- ooc ooi ook oom ooo oor oos or- orc ore ori ork orm oro orr ors os- osc ose osi osk osm oso osr oss rcc rce rci rcm rco rcr rcs re- rec ree rei rek rem reo rer res ric rie rii rik rim rio rir ris rkc rke rkk rkm rko rks rmc rme rmi rmm rmo rmr rms roc roe roi rok rom roo ror ros rrc rri rrk rrm rrr rrs rsc rse rsi rsk rsm rso rsr rss scc sce sci sck scm sco scr scs se- sec see sei sek sem seo ser ses sic sie sii sik sim sio sir sis sk- skc ske ski skk skm sko skr sks smc sme smi smk smm smo smr sms soc soe soi sok som soo sor sos sr- src sre sri srk srm sro srr srs ss- ssc sse ssi ssk ssm sso ssr sss