c-- ccc cce ccl ccm ccs ce- cec cee cel cem ces cl- clc cle cll clm cls cmc cme cml cmm cms csc cse csl csm css ec- ecc ece ecl ecm ecs eec eee eel eem ees elc ele ell elm els em- emc eme eml emm ems es- esc ese esl esm ess lcc lce lcl lcm lcs lec lee lel lem les llc lle lll llm lls lmc lme lml lmm lms lsc lse lsl lsm lss mc- mcc mce mcl mcm mcs mec mee mel mem mes mlc mle mll mlm mls mmc mme mml mmm mms msc mse msl msm mss scc sce scl scm scs se- sec see sel sem ses slc sle sll slm sls smc sme sml smm sms ss- ssc sse ssl ssm sss