c-- ccc cce ccm cco ccs cct ce- cec cee cem ceo ces cet cmc cme cmm cmo cms cmt co- coc coe com coo cos cot csc cse csm cso css cst ctc cte ctm cto cts ctt ec- ecc ece ecm eco ecs ect eec eee eem eeo ees eet em- emc eme emm emo ems emt eo- eoc eoe eom eoo eos eot es- esc ese esm eso ess est etc ete etm eto ets ett m-o mc- mcc mce mcm mco mcs mct mec mee mem meo mes met mmc mme mmm mmo mms mmt moc moe mom moo mos mot msc mse msm mso mss mst mtc mte mtm mto mts mtt oc- occ ocm oco ocs oct oec oee oem oeo oes oet om- omc ome omm omo oms omt oo- ooc oom ooo oos oot os- osc ose osm oso oss ost ot- otc ote otm oto ots ott scc sce scm sco scs sct se- sec see sem seo ses set smc sme smm smo sms smt soc soe som soo sos sot ss- ssc sse ssm sso sss sst stc ste stm sto sts stt tcc tce tcm tco tcs tct te- tec tee tem teo tes tet tmc tme tmm tmo tms tmt to- toc toe tom too tos tot tsc tse tsm tso tss tst ttc tte ttm tto tts ttt