optts potts otpts topts ptots tpots optts potts otpts topts ptots tpots ottps totps ottps totps ttops ttops pttos tptos pttos tptos ttpos ttpos optst potst otpst topst ptost tpost opstt postt osptt soptt psott spott otspt tospt ostpt sotpt tsopt stopt ptsot tpsot pstot sptot tspot stpot optst potst otpst topst ptost tpost opstt postt osptt soptt psott spott otspt tospt ostpt sotpt tsopt stopt ptsot tpsot pstot sptot tspot stpot ottsp totsp ottsp totsp ttosp ttosp otstp tostp osttp sottp tsotp stotp otstp tostp osttp sottp tsotp stotp ttsop ttsop tstop sttop tstop sttop pttso tptso pttso tptso ttpso ttpso ptsto tpsto pstto sptto tspto stpto ptsto tpsto pstto sptto tspto stpto ttspo ttspo tstpo sttpo tstpo sttpo
Note: these 'words' (valid or invalid) are all the permutations of the word optts. These words are obtained by scrambling the letters in optts.