-er c-- ccc ccd cce cck ccm cco ccr ccs cdc cdd cde cdk cdm cdo cdr cds ce- cec ced cee cek cem ceo cer ces ckc ckd ckm cko cks cmc cmd cme cmk cmm cmo cmr cms co- coc cod coe cok com coo cor cos crc crd cre crk crm cro crr crs csc csd cse csk csm cso csr css dcc dcd dce dck dcm dco dcr dcs ddc ddd dde ddk ddm ddo ddr dds de- dec ded dee dek dem deo der des dkc dke dkk dkm dko dkr dks dmc dmd dme dmk dmm dmo dmr dms doc dod doe dok dom doo dor dos drc drd dre drk drm dro drr drs dsc dsd dse dsk dsm dso dsr dss ec- ecc ecd ece eck ecm eco ecr ecs ed- edc edd ede edk edm edo edr eds eec eed eee eek eem eeo eer ees ekc ekd eke eko ekr eks em- emc emd eme emk emm emo emr ems eo- eoc eod eoe eok eom eoo eor eos erc erd ere erk erm ero err ers es- esc esd ese esk esm eso esr ess kcc kcd kce kck kcm kcr kcs kdc kde kdk kdm kdo kdr kds ke- kec ked kee kek kem keo ker kes kkc kke kkk kkm kkr kks kmc kmd kme kmk kmm kmo kms koc kod koe kok kom koo kor kos krc krd krk kro krr krs ksc ksd kse ksk ksm kso ksr kss m-o m-r mc- mcc mcd mce mck mcm mco mcr mcs mdc mdd mde mdk mdm mdo mdr mds mec med mee mek mem meo mer mes mkc mkd mke mkk mkm mko mkr mks mmc mmd mme mmk mmm mmo mmr mms moc mod moe mok mom moo mor mos mrc mrd mre mrk mrm mro mrr mrs msc msd mse msk msm mso msr mss oc- occ ocd ock ocm oco ocr ocs odc odd ode odm odo odr ods oec oed oee oem oeo oer oes okc okd oke okk oko okr oks om- omc omd ome omm omo omr oms oo- ooc ood ook oom ooo oor oos or- orc ord ore ork orm oro orr ors os- osc osd ose osk osm oso osr oss rcc rcd rce rcm rco rcr rcs rdc rdd rde rdm rdo rdr rds re- rec red ree rek rem reo rer res rkc rke rkk rkm rko rks rmc rmd rme rmm rmo rmr rms roc rod roe rok rom roo ror ros rrc rrd rrk rrm rrr rrs rsc rsd rse rsk rsm rso rsr rss scc scd sce sck scm sco scr scs sdc sdd sde sdk sdm sdo sdr sds se- sec sed see sek sem seo ser ses sk- skc skd ske skk skm sko skr sks smc smd sme smk smm smo smr sms soc sod soe sok som soo sor sos sr- src srd sre srk srm sro srr srs ss- ssc ssd sse ssk ssm sso ssr sss