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