c-- ccc cce ccl ccm cct ce- cec cee cel cem cet cl- clc cle cll clm clt cmc cme cml cmm cmt ctc cte ctl ctm ctt ec- ecc ece ecl ecm ect eec eee eel eem eet elc ele ell elm elt em- emc eme eml emm emt etc ete etl etm ett lcc lce lcl lcm lct lec lee lel lem let llc lle lll llm llt lmc lme lml lmm lmt ltc lte ltl ltm ltt mc- mcc mce mcl mcm mct mec mee mel mem met mlc mle mll mlm mlt mmc mme mml mmm mmt mtc mte mtl mtm mtt tcc tce tcl tcm tct te- tec tee tel tem tet tlc tle tll tlm tlt tmc tme tml tmm tmt ttc tte ttl ttm ttt