cteco tceco cetco ectco tecco etcco ctceo tcceo ccteo ccteo tcceo ctceo cecto eccto cceto cceto eccto cecto tecco etcco tceco cteco ectco cetco cteoc tceoc cetoc ectoc tecoc etcoc ctoec tcoec cotec octec tocec otcec ceotc ecotc coetc ocetc eoctc oectc teocc etocc toecc otecc eotcc oetcc ctcoe tccoe cctoe cctoe tccoe ctcoe ctoce tcoce cotce octce tocce otcce ccote ccote cocte occte cocte occte tcoce ctoce tocce otcce cotce octce cecot eccot cceot cceot eccot cecot ceoct ecoct coect ocect eocct oecct ccoet ccoet cocet occet cocet occet ecoct ceoct eocct oecct coect ocect tecoc etcoc tceoc cteoc ectoc cetoc teocc etocc toecc otecc eotcc oetcc tcoec ctoec tocec otcec cotec octec ecotc ceotc eoctc oectc coetc ocetc
Note: these 'words' (valid or invalid) are all the permutations of the word cteco. These words are obtained by scrambling the letters in cteco.