c-- ccc ccd cce cco cct cdc cdd cde cdo cdt ce- cec ced cee ceo cet co- coc cod coe coo cot ctc ctd cte cto ctt dcc dcd dce dco dct ddc ddd dde ddo ddt de- dec ded dee deo det doc dod doe doo dot dtc dtd dte dto dtt ec- ecc ecd ece eco ect ed- edc edd ede edo edt eec eed eee eeo eet eo- eoc eod eoe eoo eot etc etd ete eto ett oc- occ ocd oco oct odc odd ode odo odt oec oed oee oeo oet oo- ooc ood ooo oot ot- otc otd ote oto ott tcc tcd tce tco tct tdc tdd tde tdo tdt te- tec ted tee teo tet to- toc tod toe too tot ttc ttd tte tto ttt