c-- ccc cce ccl ccm ccs cct ce- cec cee cel cem ces cet cl- clc cle cll clm cls clt cmc cme cml cmm cms cmt csc cse csl csm css cst ctc cte ctl ctm cts ctt ec- ecc ece ecl ecm ecs ect eec eee eel eem ees eet elc ele ell elm els elt em- emc eme eml emm ems emt es- esc ese esl esm ess est etc ete etl etm ets ett lcc lce lcl lcm lcs lct lec lee lel lem les let llc lle lll llm lls llt lmc lme lml lmm lms lmt lsc lse lsl lsm lss lst ltc lte ltl ltm lts ltt mc- mcc mce mcl mcm mcs mct mec mee mel mem mes met mlc mle mll mlm mls mlt mmc mme mml mmm mms mmt msc mse msl msm mss mst mtc mte mtl mtm mts mtt scc sce scl scm scs sct se- sec see sel sem ses set slc sle sll slm sls slt smc sme sml smm sms smt ss- ssc sse ssl ssm sss sst stc ste stl stm sts stt tcc tce tcl tcm tcs tct te- tec tee tel tem tes tet tlc tle tll tlm tls tlt tmc tme tml tmm tms tmt tsc tse tsl tsm tss tst ttc tte ttl ttm tts ttt