deffo edffo dfefo fdefo efdfo fedfo deffo edffo dfefo fdefo efdfo fedfo dffeo fdfeo dffeo fdfeo ffdeo ffdeo effdo fefdo effdo fefdo ffedo ffedo defof edfof dfeof fdeof efdof fedof deoff edoff doeff odeff eodff oedff dfoef fdoef dofef odfef fodef ofdef efodf feodf eofdf oefdf foedf ofedf defof edfof dfeof fdeof efdof fedof deoff edoff doeff odeff eodff oedff dfoef fdoef dofef odfef fodef ofdef efodf feodf eofdf oefdf foedf ofedf dffoe fdfoe dffoe fdfoe ffdoe ffdoe dfofe fdofe doffe odffe fodfe ofdfe dfofe fdofe doffe odffe fodfe ofdfe ffode ffode fofde offde fofde offde effod fefod effod fefod ffeod ffeod efofd feofd eoffd oeffd foefd ofefd efofd feofd eoffd oeffd foefd ofefd ffoed ffoed fofed offed fofed offed
Note: these 'words' (valid or invalid) are all the permutations of the word deffo. These words are obtained by scrambling the letters in deffo.