c-- ccc ccd cce cco cct ccx cdc cdd cde cdo cdt cdx ce- cec ced cee ceo cet cex co- coc cod coe coo cot cox ctc ctd cte cto ctt ctx cxc cxo cxt cxx dcc dcd dce dco dct dcx ddc ddd dde ddo ddt ddx de- dec ded dee deo det dex doc dod doe doo dot dox dtc dtd dte dto dtt dtx dxc dxd dxo dxt dxx ec- ecc ecd ece eco ect ecx ed- edc edd ede edo edt edx eec eed eee eeo eet eex eo- eoc eod eoe eoo eot etc etd ete eto ett etx ex- exc exd exe exo ext exx oc- occ ocd oco oct ocx odc odd ode odo odt oec oed oee oeo oet oex oo- ooc ood ooo oot oox ot- otc otd ote oto ott ox- oxc oxo oxt oxx t-x tcc tcd tce tco tct tcx tdc tdd tde tdo tdt tdx te- tec ted tee teo tet tex to- toc tod toe too tot tox ttc ttd tte tto ttt ttx txe txt xcd xcx xdc xde xdt xed xee xet xex xoc xod xoo xot xox xtc xtx xxo xxx