prexy rpexy perxy eprxy repxy erpxy prxey rpxey pxrey xprey rxpey xrpey pexry epxry pxery xpery expry xepry rexpy erxpy rxepy xrepy exrpy xerpy preyx rpeyx peryx epryx repyx erpyx pryex rpyex pyrex yprex rypex yrpex peyrx epyrx pyerx yperx eyprx yeprx reypx erypx ryepx yrepx eyrpx yerpx prxye rpxye pxrye xprye rxpye xrpye pryxe rpyxe pyrxe yprxe rypxe yrpxe pxyre xpyre pyxre ypxre xypre yxpre rxype xrype ryxpe yrxpe xyrpe yxrpe pexyr epxyr pxeyr xpeyr expyr xepyr peyxr epyxr pyexr ypexr eypxr yepxr pxyer xpyer pyxer ypxer xyper yxper exypr xeypr eyxpr yexpr xyepr yxepr rexyp erxyp rxeyp xreyp exryp xeryp reyxp eryxp ryexp yrexp eyrxp yerxp rxyep xryep ryxep yrxep xyrep yxrep exyrp xeyrp eyxrp yexrp xyerp yxerp
Note: these 'words' (valid or invalid) are all the permutations of the word prexy. These words are obtained by scrambling the letters in prexy.