c-- ccc cce ccm ccn ccs cct ce- cec cee cem cen ces cet cmc cme cmm cmn cms cmt cn- cnc cne cnm cnn cns cnt csc cse csm csn css cst ctc cte ctm ctn cts ctt ec- ecc ece ecm ecn ecs ect eec eee eem een ees eet em- emc eme emm emn ems emt en- enc ene enm enn ens ent es- esc ese esm esn ess est etc ete etm etn ets ett mc- mcc mce mcm mcn mcs mct mec mee mem men mes met mmc mme mmm mmn mms mmt mnc mne mnm mnn mns mnt msc mse msm msn mss mst mtc mte mtm mtn mts mtt ncc nce ncm ncn ncs nct ne- nec nee nem nen nes net nmc nme nmm nmn nms nmt nnc nne nnm nnn nns nnt nsc nse nsm nsn nss nst ntc nte ntm ntn nts ntt scc sce scm scn scs sct se- sec see sem sen ses set smc sme smm smn sms smt snc sne snm snn sns snt ss- ssc sse ssm ssn sss sst stc ste stm stn sts stt tcc tce tcm tcn tcs tct te- tec tee tem ten tes tet tmc tme tmm tmn tms tmt tnc tne tnm tnn tns tnt tsc tse tsm tsn tss tst ttc tte ttm ttn tts ttt