c-- ccc ccd cce cct ccx cdc cdd cde cdt cdx ce- cec ced cee cet cex ctc ctd cte ctt ctx cxc cxt cxx dcc dcd dce dct dcx ddc ddd dde ddt ddx de- dec ded dee det dex dtc dtd dte dtt dtx dxc dxd dxt dxx ec- ecc ecd ece ect ecx ed- edc edd ede edt edx eec eed eee eet eex etc etd ete ett etx ex- exc exd exe ext exx t-x tcc tcd tce tct tcx tdc tdd tde tdt tdx te- tec ted tee tet tex ttc ttd tte ttt ttx txe txt xcd xcx xdc xde xdt xed xee xet xex xtc xtx xxx