c-- ccc ccd cce ccf cct cdc cdd cde cdf cdt ce- cec ced cee cef cet cfc cfd cfe cff cft ctc ctd cte ctf ctt dcc dcd dce dcf dct ddc ddd dde ddf ddt de- dec ded dee def det dfc dfd dfe dff dft dtc dtd dte dtf dtt ec- ecc ecd ece ecf ect ed- edc edd ede edf edt eec eed eee eef eet ef- efc efd efe eff eft etc etd ete etf ett fcc fcd fce fcf fct fdc fdd fde fdf fdt fec fed fee fef fet ffc ffd ffe fff fft ftc ftd fte ftf ftt tcc tcd tce tcf tct tdc tdd tde tdf tdt te- tec ted tee tef tet tfc tfd tfe tff tft ttc ttd tte ttf ttt