c-- ccc ccd cce cck ccm ccs cdc cdd cde cdk cdm cds ce- cec ced cee cek cem ces ckc ckd ckm cks cmc cmd cme cmk cmm cms csc csd cse csk csm css dcc dcd dce dck dcm dcs ddc ddd dde ddk ddm dds de- dec ded dee dek dem des dkc dke dkk dkm dks dmc dmd dme dmk dmm dms dsc dsd dse dsk dsm dss ec- ecc ecd ece eck ecm ecs ed- edc edd ede edk edm eds eec eed eee eek eem ees ekc ekd eke eks em- emc emd eme emk emm ems es- esc esd ese esk esm ess kcc kcd kce kck kcm kcs kdc kde kdk kdm kds ke- kec ked kee kek kem kes kkc kke kkk kkm kks kmc kmd kme kmk kmm kms ksc ksd kse ksk ksm kss mc- mcc mcd mce mck mcm mcs mdc mdd mde mdk mdm mds mec med mee mek mem mes mkc mkd mke mkk mkm mks mmc mmd mme mmk mmm mms msc msd mse msk msm mss scc scd sce sck scm scs sdc sdd sde sdk sdm sds se- sec sed see sek sem ses sk- skc skd ske skk skm sks smc smd sme smk smm sms ss- ssc ssd sse ssk ssm sss