c-- ccc cce ccm ccs ccz ce- cec cee cem ces cez cmc cme cmm cms csc cse csm css csz cz- czc cze czm ec- ecc ece ecm ecs eec eee eem ees em- emc eme emm ems es- esc ese esm ess eze ezs ezz mc- mcc mce mcm mcs mcz mec mee mem mes mez mmc mme mmm mms mmz msc mse msm mss mzm scc sce scm scs se- sec see sem ses sez smc sme smm sms smz ss- ssc sse ssm sss ssz sze zce zcs zec zee zem zes zez zmc zmm zms zse zsm zsz zzs zzz