c-- ccc cce ccm ccn cct ce- cec cee cem cen cet cmc cme cmm cmn cmt cn- cnc cne cnm cnn cnt ctc cte ctm ctn ctt ec- ecc ece ecm ecn ect eec eee eem een eet em- emc eme emm emn emt en- enc ene enm enn ent etc ete etm etn ett mc- mcc mce mcm mcn mct mec mee mem men met mmc mme mmm mmn mmt mnc mne mnm mnn mnt mtc mte mtm mtn mtt ncc nce ncm ncn nct ne- nec nee nem nen net nmc nme nmm nmn nmt nnc nne nnm nnn nnt ntc nte ntm ntn ntt tcc tce tcm tcn tct te- tec tee tem ten tet tmc tme tmm tmn tmt tnc tne tnm tnn tnt ttc tte ttm ttn ttt