c-- ccc cce ccm ccn ccs ce- cec cee cem cen ces cmc cme cmm cmn cms cn- cnc cne cnm cnn cns csc cse csm csn css ec- ecc ece ecm ecn ecs eec eee eem een ees em- emc eme emm emn ems en- enc ene enm enn ens es- esc ese esm esn ess mc- mcc mce mcm mcn mcs mec mee mem men mes mmc mme mmm mmn mms mnc mne mnm mnn mns msc mse msm msn mss ncc nce ncm ncn ncs ne- nec nee nem nen nes nmc nme nmm nmn nms nnc nne nnm nnn nns nsc nse nsm nsn nss scc sce scm scn scs se- sec see sem sen ses smc sme smm smn sms snc sne snm snn sns ss- ssc sse ssm ssn sss