stohi tsohi sothi osthi toshi otshi sthoi tshoi shtoi hstoi thsoi htsoi sohti oshti shoti hsoti ohsti hosti tohsi othsi thosi htosi ohtsi hotsi stoih tsoih sotih ostih tosih otsih stioh tsioh sitoh istoh tisoh itsoh soith osith sioth isoth oisth iosth toish otish tiosh itosh oitsh iotsh sthio tshio shtio hstio thsio htsio stiho tsiho sitho istho tisho itsho shito hsito sihto ishto histo ihsto thiso htiso tihso ithso hitso ihtso sohit oshit shoit hsoit ohsit hosit soiht osiht sioht isoht oisht iosht shiot hsiot sihot ishot hisot ihsot ohist hoist oihst iohst hiost ihost tohis othis thois htois ohtis hotis toihs otihs tiohs itohs oiths ioths thios htios tihos ithos hitos ihtos ohits hoits oihts iohts hiots ihots
Note: these 'words' (valid or invalid) are all the permutations of the word stohi. These words are obtained by scrambling the letters in stohi.