c-- ccc cce cco cct ccx ce- cec cee ceo cet cex co- coc coe coo cot cox ctc cte cto ctt ctx cxc cxo cxt cxx ec- ecc ece eco ect ecx eec eee eeo eet eex eo- eoc eoe eoo eot etc ete eto ett etx ex- exc exe exo ext exx oc- occ oco oct ocx oec oee oeo oet oex oo- ooc ooo oot oox ot- otc ote oto ott ox- oxc oxo oxt oxx t-x tcc tce tco tct tcx te- tec tee teo tet tex to- toc toe too tot tox ttc tte tto ttt ttx txe txt xcx xee xet xex xoc xoo xot xox xtc xtx xxo xxx