-er -ic c-- ccc cce cci ccm cco ccr ccs ce- cec cee cei cem ceo cer ces ci- cic cie cii cim cio cir cis cmc cme cmi cmm cmo cmr cms co- coc coe coi com coo cor cos crc cre cri crm cro crr crs csc cse csi csm cso csr css ec- ecc ece eci ecm eco ecr ecs eec eee eem eeo eer ees eic eie eii eim eio eir eis em- emc eme emi emm emo emr ems eo- eoc eoe eoi eom eoo eor eos erc ere eri erm ero err ers es- esc ese esi esm eso esr ess icc ice ici icm ico icr ics ie- iec iee iei iem ier ies iic iie iii iim iio iir iis im- imc ime imi imm imo ims io- ioc ioe ioi iom ioo ior ios ir- irc ire iri irm iro irr irs is- isc ise isi ism iso isr iss m-o m-r mc- mcc mce mci mcm mco mcr mcs mec mee mei mem meo mer mes mi- mic mie mii mim mio mir mis mmc mme mmi mmm mmo mmr mms moc moe moi mom moo mor mos mrc mre mri mrm mro mrr mrs msc mse msi msm mso msr mss o-i oc- occ oci ocm oco ocr ocs oec oee oei oem oeo oer oes oic oie oii oim oio oir ois om- omc ome omi omm omo omr oms oo- ooc ooi oom ooo oor oos or- orc ore ori orm oro orr ors os- osc ose osi osm oso osr oss rcc rce rci rcm rco rcr rcs re- rec ree rei rem reo rer res ric rie rii rim rio rir ris rmc rme rmi rmm rmo rmr rms roc roe roi rom roo ror ros rrc rri rrm rrr rrs rsc rse rsi rsm rso rsr rss scc sce sci scm sco scr scs se- sec see sei sem seo ser ses sic sie sii sim sio sir sis smc sme smi smm smo smr sms soc soe soi som soo sor sos sr- src sre sri srm sro srr srs ss- ssc sse ssi ssm sso ssr sss