tiffs itffs tfifs ftifs iftfs fitfs tiffs itffs tfifs ftifs iftfs fitfs tffis ftfis tffis ftfis fftis fftis iffts fifts iffts fifts ffits ffits tifsf itfsf tfisf ftisf iftsf fitsf tisff itsff tsiff stiff istff sitff tfsif ftsif tsfif stfif fstif sftif ifstf fistf isftf siftf fsitf sfitf tifsf itfsf tfisf ftisf iftsf fitsf tisff itsff tsiff stiff istff sitff tfsif ftsif tsfif stfif fstif sftif ifstf fistf isftf siftf fsitf sfitf tffsi ftfsi tffsi ftfsi fftsi fftsi tfsfi ftsfi tsffi stffi fstfi sftfi tfsfi ftsfi tsffi stffi fstfi sftfi ffsti ffsti fsfti sffti fsfti sffti iffst fifst iffst fifst ffist ffist ifsft fisft isfft sifft fsift sfift ifsft fisft isfft sifft fsift sfift ffsit ffsit fsfit sffit fsfit sffit
Note: these 'words' (valid or invalid) are all the permutations of the word tiffs. These words are obtained by scrambling the letters in tiffs.