-er c-- ccc cce ccm ccn cco ccr ccs ce- cec cee cem cen ceo cer ces cmc cme cmm cmn cmo cmr cms cn- cnc cne cnm cnn cno cnr cns co- coc coe com con coo cor cos crc cre crm crn cro crr crs csc cse csm csn cso csr css ec- ecc ece ecm ecn eco ecr ecs eec eee eem een eeo eer ees em- emc eme emm emn emo emr ems en- enc ene enm enn eno enr ens eo- eoc eoe eom eon eoo eor eos erc ere erm ern ero err ers es- esc ese esm esn eso esr ess m-o m-r mc- mcc mce mcm mcn mco mcr mcs mec mee mem men meo mer mes mmc mme mmm mmn mmo mmr mms mnc mne mnm mnn mno mnr mns moc moe mom mon moo mor mos mrc mre mrm mrn mro mrr mrs msc mse msm msn mso msr mss ncc nce ncm ncn nco ncr ncs ne- nec nee nem nen neo ner nes nmc nme nmm nmn nmo nmr nms nnc nne nnm nnn nno nns no- noc noe nom non noo nor nos nrc nre nrm nrn nro nrr nrs nsc nse nsm nsn nso nsr nss oc- occ ocm ocn oco ocr ocs oec oee oem oen oeo oer oes om- omc ome omm omn omo omr oms on- onc one onn ono onr ons oo- ooc oom oon ooo oor oos or- orc ore orm orn oro orr ors os- osc ose osm osn oso osr oss rcc rce rcm rcn rco rcr rcs re- rec ree rem ren reo rer res rmc rme rmm rmn rmo rmr rms rnc rnm rnn rno rnr rns roc roe rom ron roo ror ros rrc rrm rrn rrr rrs rsc rse rsm rsn rso rsr rss scc sce scm scn sco scr scs se- sec see sem sen seo ser ses smc sme smm smn smo smr sms snc sne snm snn sno snr sns soc soe som son soo sor sos sr- src sre srm srn sro srr srs ss- ssc sse ssm ssn sso ssr sss