c-- ccc cce ccl ccm ccn ce- cec cee cel cem cen cl- clc cle cll clm cln cmc cme cml cmm cmn cn- cnc cne cnl cnm cnn ec- ecc ece ecl ecm ecn eec eee eel eem een elc ele ell elm eln em- emc eme eml emm emn en- enc ene enl enm enn lcc lce lcl lcm lcn lec lee lel lem len llc lle lll llm lln lmc lme lml lmm lmn lnc lne lnl lnm lnn mc- mcc mce mcl mcm mcn mec mee mel mem men mlc mle mll mlm mln mmc mme mml mmm mmn mnc mne mnl mnm mnn ncc nce ncl ncm ncn ne- nec nee nel nem nen nlc nle nll nlm nln nmc nme nml nmm nmn nnc nne nnl nnm nnn