c-- ccc cce cck ccm ccn ce- cec cee cek cem cen ckc ckm cmc cme cmk cmm cmn cn- cnc cne cnm cnn ec- ecc ece eck ecm ecn eec eee eek eem een ekc eke em- emc eme emk emm emn en- enc ene enk enm enn kcc kce kck kcm kcn ke- kec kee kek kem ken kkc kke kkk kkm kkn kmc kme kmk kmm kn- knc kne knk knm knn mc- mcc mce mck mcm mcn mec mee mek mem men mkc mke mkk mkm mkn mmc mme mmk mmm mmn mnc mne mnk mnm mnn ncc nce nck ncm ncn ne- nec nee nek nem nen nkc nke nkk nkm nkn nmc nme nmk nmm nmn nnc nne nnk nnm nnn