shist hsist sihst ishst hisst ihsst shsit hssit sshit sshit hssit shsit sisht issht ssiht ssiht issht sisht hisst ihsst hsist shist ishst sihst shits hsits sihts ishts hists ihsts shtis hstis sthis tshis htsis thsis siths isths stihs tsihs itshs tishs hitss ihtss htiss thiss ithss tihss shsti hssti sshti sshti hssti shsti shtsi hstsi sthsi tshsi htssi thssi ssthi ssthi stshi tsshi stshi tsshi hstsi shtsi htssi thssi sthsi tshsi sisth issth ssith ssith issth sisth sitsh istsh stish tsish itssh tissh sstih sstih stsih tssih stsih tssih istsh sitsh itssh tissh stish tsish hists ihsts hsits shits ishts sihts hitss ihtss htiss thiss ithss tihss hstis shtis htsis thsis sthis tshis isths siths itshs tishs stihs tsihs
Note: these 'words' (valid or invalid) are all the permutations of the word shist. These words are obtained by scrambling the letters in shist.