defog edfog dfeog fdeog efdog fedog deofg edofg doefg odefg eodfg oedfg dfoeg fdoeg dofeg odfeg fodeg ofdeg efodg feodg eofdg oefdg foedg ofedg defgo edfgo dfego fdego efdgo fedgo degfo edgfo dgefo gdefo egdfo gedfo dfgeo fdgeo dgfeo gdfeo fgdeo gfdeo efgdo fegdo egfdo gefdo fgedo gfedo deogf edogf doegf odegf eodgf oedgf degof edgof dgeof gdeof egdof gedof dogef odgef dgoef gdoef ogdef godef eogdf oegdf egodf geodf ogedf goedf dfoge fdoge dofge odfge fodge ofdge dfgoe fdgoe dgfoe gdfoe fgdoe gfdoe dogfe odgfe dgofe gdofe ogdfe godfe fogde ofgde fgode gfode ogfde gofde efogd feogd eofgd oefgd foegd ofegd efgod fegod egfod gefod fgeod gfeod eogfd oegfd egofd geofd ogefd goefd foged ofged fgoed gfoed ogfed gofed
Note: these 'words' (valid or invalid) are all the permutations of the word defog. These words are obtained by scrambling the letters in defog.