c-- ccc ccd cce cck ccm cco cdc cdd cde cdk cdm cdo ce- cec ced cee cek cem ceo ckc ckd ckm cko cmc cmd cme cmk cmm cmo co- coc cod coe cok com coo dcc dcd dce dck dcm dco ddc ddd dde ddk ddm ddo de- dec ded dee dek dem deo dkc dke dkk dkm dko dmc dmd dme dmk dmm dmo doc dod doe dok dom doo ec- ecc ecd ece eck ecm eco ed- edc edd ede edk edm edo eec eed eee eek eem eeo ekc ekd eke eko em- emc emd eme emk emm emo eo- eoc eod eoe eok eom eoo kcc kcd kce kck kcm kdc kde kdk kdm kdo ke- kec ked kee kek kem keo kkc kke kkk kkm kmc kmd kme kmk kmm kmo koc kod koe kok kom koo m-o mc- mcc mcd mce mck mcm mco mdc mdd mde mdk mdm mdo mec med mee mek mem meo mkc mkd mke mkk mkm mko mmc mmd mme mmk mmm mmo moc mod moe mok mom moo oc- occ ocd ock ocm oco odc odd ode odm odo oec oed oee oem oeo okc okd oke okk oko om- omc omd ome omm omo oo- ooc ood ook oom ooo