sists issts ssits ssits issts sists sitss istss stiss tsiss itsss tisss sstis sstis stsis tssis stsis tssis istss sitss itsss tisss stiss tsiss sisst issst ssist ssist issst sisst sisst issst ssist ssist issst sisst sssit sssit sssit sssit sssit sssit issst sisst issst sisst ssist ssist sitss istss stiss tsiss itsss tisss sists issts ssits ssits issts sists stsis tssis sstis sstis tssis stsis itsss tisss istss sitss tsiss stiss sstsi sstsi stssi tsssi stssi tsssi sssti sssti sssti sssti sssti sssti stssi tsssi sstsi sstsi tsssi stssi stssi tsssi sstsi sstsi tsssi stssi istss sitss itsss tisss stiss tsiss issts sists issts sists ssits ssits itsss tisss istss sitss tsiss stiss stsis tssis sstis sstis tssis stsis
Note: these 'words' (valid or invalid) are all the permutations of the word sists. These words are obtained by scrambling the letters in sists.