hesur ehsur hseur sheur eshur sehur heusr ehusr huesr uhesr euhsr uehsr hsuer shuer huser uhser suher usher esuhr seuhr eushr ueshr suehr usehr hesru ehsru hseru sheru eshru sehru hersu ehrsu hresu rhesu erhsu rehsu hsreu shreu hrseu rhseu srheu rsheu esrhu serhu ershu reshu srehu rsehu heurs ehurs huers uhers euhrs uehrs herus ehrus hreus rheus erhus rehus hures uhres hrues rhues urhes ruhes eurhs uerhs eruhs reuhs urehs ruehs hsure shure husre uhsre suhre ushre hsrue shrue hrsue rhsue srhue rshue hurse uhrse hruse rhuse urhse ruhse surhe usrhe sruhe rsuhe urshe rushe esurh seurh eusrh uesrh suerh userh esruh seruh ersuh resuh sreuh rseuh eursh uersh erush reush uresh ruesh sureh usreh srueh rsueh urseh ruseh
Note: these 'words' (valid or invalid) are all the permutations of the word hesur. These words are obtained by scrambling the letters in hesur.