c-- ccc cce ccm cco cct ccx ce- cec cee cem ceo cet cex cmc cme cmm cmo cmt cmx co- coc coe com coo cot cox ctc cte ctm cto ctt ctx cxc cxo cxt cxx ec- ecc ece ecm eco ect ecx eec eee eem eeo eet eex em- emc eme emm emo emt emx eo- eoc eoe eom eoo eot etc ete etm eto ett etx ex- exc exe exo ext exx m-o mc- mcc mce mcm mco mct mcx mec mee mem meo met mex mmc mme mmm mmo mmt mmx moc moe mom moo mot mox mtc mte mtm mto mtt mtx mxc oc- occ ocm oco oct ocx oec oee oem oeo oet oex om- omc ome omm omo omt omx oo- ooc oom ooo oot oox ot- otc ote otm oto ott ox- oxc oxo oxt oxx t-x tcc tce tcm tco tct tcx te- tec tee tem teo tet tex tmc tme tmm tmo tmt tmx to- toc toe tom too tot tox ttc tte ttm tto ttt ttx txe txt xcx xee xem xet xex xmc xmm xmo xmt xmx xoc xom xoo xot xox xtc xtm xtx xxo xxx