-ey c-- ccc cce cco cct ccx ce- cec cee ceo cet cex cey co- coc coe coo cot cox coy ctc cte cto ctt ctx cty cxc cxo cxt cxx cyc cye cyo cyt ec- ecc ece eco ect ecx eec eee eeo eet eex eey eo- eoc eoe eoo eot etc ete eto ett etx ety ex- exc exe exo ext exx exy eyc eye eyo eyt oc- occ oco oct ocx oec oee oeo oet oex oey oo- ooc ooo oot oox ot- otc ote oto ott ox- oxc oxo oxt oxx oxy oye oyo t-x tcc tce tco tct tcx te- tec tee teo tet tex tey to- toc toe too tot tox toy ttc tte tto ttt ttx tty txe txt tyc tye tyo tyt xcx xee xet xex xoc xoo xot xox xtc xtx xty xxo xxx xxy xyy ycc yce yco ycy yec yee yeo yet yex yey yoc yoe yoo yot yox yoy ytc yte yto ytt yxe yxy yyc yye yyt yyy