c-- ccc cce ccm ccs cct ce- cec cee cem ces cet cmc cme cmm cms cmt csc cse csm css cst ctc cte ctm cts ctt ec- ecc ece ecm ecs ect eec eee eem ees eet em- emc eme emm ems emt es- esc ese esm ess est etc ete etm ets ett mc- mcc mce mcm mcs mct mec mee mem mes met mmc mme mmm mms mmt msc mse msm mss mst mtc mte mtm mts mtt scc sce scm scs sct se- sec see sem ses set smc sme smm sms smt ss- ssc sse ssm sss sst stc ste stm sts stt tcc tce tcm tcs tct te- tec tee tem tes tet tmc tme tmm tms tmt tsc tse tsm tss tst ttc tte ttm tts ttt