rerun errun rreun rreun errun rerun reurn erurn ruern urern eurrn uerrn rruen rruen ruren urren ruren urren erurn reurn eurrn uerrn ruern urern rernu errnu rrenu rrenu errnu rernu renru ernru rneru nreru enrru nerru rrneu rrneu rnreu nrreu rnreu nrreu ernru renru enrru nerru rneru nreru reunr erunr ruenr urenr eurnr uernr renur ernur rneur nreur enrur nerur runer urner rnuer nruer unrer nurer eunrr uenrr enurr neurr unerr nuerr rrune rrune rurne urrne rurne urrne rrnue rrnue rnrue nrrue rnrue nrrue runre urnre rnure nrure unrre nurre runre urnre rnure nrure unrre nurre erunr reunr eurnr uernr ruenr urenr ernur renur enrur nerur rneur nreur eunrr uenrr enurr neurr unerr nuerr runer urner rnuer nruer unrer nurer
Note: these 'words' (valid or invalid) are all the permutations of the word rerun. These words are obtained by scrambling the letters in rerun.