c-- ccc cce cco cct ccv ccx ce- cec cee ceo cet cev cex co- coc coe coo cot cov cox ctc cte cto ctt ctv ctx cvc cve cvo cvt cvv cvx cxc cxo cxt cxv cxx ec- ecc ece eco ect ecv ecx eec eee eeo eet eev eex eo- eoc eoe eoo eot etc ete eto ett etv etx evc eve evo evt evv ex- exc exe exo ext exx oc- occ oco oct ocv ocx oec oee oeo oet oex oo- ooc ooo oot oov oox ot- otc ote oto ott otv ov- ovc ove ovo ovv ox- oxc oxo oxt oxx t-x tcc tce tco tct tcv tcx te- tec tee teo tet tev tex to- toc toe too tot tov tox ttc tte tto ttt ttv ttx tvc tve tvo tvt tvx txe txt v-e vcc vce vco vct vcx vec vee veo vet vex voc voe voo vot vov vox vtc vte vto vtt vtv vtx vvc vvo vvt vvv vxv xcv xcx xee xet xev xex xoc xoo xot xov xox xtc xtv xtx xvt xxo xxv xxx