-er -ic c-- ccc ccd cce cci cck ccm cco ccr cdc cdd cde cdi cdk cdm cdo cdr ce- cec ced cee cei cek cem ceo cer ci- cic cid cie cii cik cim cio cir ckc ckd cki ckm cko cmc cmd cme cmi cmk cmm cmo cmr co- coc cod coe coi cok com coo cor crc crd cre cri crk crm cro crr dcc dcd dce dci dck dcm dco dcr ddc ddd dde ddi ddk ddm ddo ddr de- dec ded dee dei dek dem deo der di- dic did die dii dik dim dio dir dkc dke dki dkk dkm dko dkr dmc dmd dme dmi dmk dmm dmo dmr doc dod doe doi dok dom doo dor drc drd dre dri drk drm dro drr ec- ecc ecd ece eci eck ecm eco ecr ed- edc edd ede edi edk edm edo edr eec eed eee eek eem eeo eer eic eid eie eii eik eim eio eir ekc ekd eke eki eko ekr em- emc emd eme emi emk emm emo emr eo- eoc eod eoe eoi eok eom eoo eor erc erd ere eri erk erm ero err i-d icc icd ice ici ick icm ico icr idc idd ide idi idk idm ido idr ie- iec ied iee iei iek iem ier iic iid iie iii iim iio iir ikc ike iki ikk iko ikr im- imc imd ime imi imm imo io- ioc iod ioe ioi iom ioo ior ir- irc ird ire iri irk irm iro irr kcc kcd kce kci kck kcm kcr kdc kde kdk kdm kdo kdr ke- kec ked kee kei kek kem keo ker kic kid kie kii kik kim kio kir kkc kke kki kkk kkm kkr kmc kmd kme kmi kmk kmm kmo koc kod koe koi kok kom koo kor krc krd kri krk kro krr m-o m-r mc- mcc mcd mce mci mck mcm mco mcr mdc mdd mde mdi mdk mdm mdo mdr mec med mee mei mek mem meo mer mi- mic mid mie mii mik mim mio mir mkc mkd mke mkk mkm mko mkr mmc mmd mme mmi mmk mmm mmo mmr moc mod moe moi mok mom moo mor mrc mrd mre mri mrk mrm mro mrr o-i oc- occ ocd oci ock ocm oco ocr odc odd ode odi odm odo odr oec oed oee oei oem oeo oer oic oid oie oii oik oim oio oir okc okd oke oki okk oko okr om- omc omd ome omi omm omo omr oo- ooc ood ooi ook oom ooo oor or- orc ord ore ori ork orm oro orr rcc rcd rce rci rcm rco rcr rdc rdd rde rdi rdm rdo rdr re- rec red ree rei rek rem reo rer ric rid rie rii rik rim rio rir rkc rke rkk rkm rko rmc rmd rme rmi rmm rmo rmr roc rod roe roi rok rom roo ror rrc rrd rri rrk rrm rrr