gresu rgesu gersu egrsu regsu ergsu grseu rgseu gsreu sgreu rsgeu srgeu gesru egsru gseru sgeru esgru segru resgu ersgu rsegu sregu esrgu sergu greus rgeus gerus egrus regus ergus grues rgues gures ugres ruges urges geurs egurs guers ugers eugrs uegrs reugs erugs ruegs uregs eurgs uergs grsue rgsue gsrue sgrue rsgue srgue gruse rguse gurse ugrse rugse urgse gsure sgure gusre ugsre sugre usgre rsuge sruge rusge ursge surge usrge gesur egsur gseur sgeur esgur segur geusr egusr guesr ugesr eugsr uegsr gsuer sguer guser ugser suger usger esugr seugr eusgr uesgr suegr usegr resug ersug rseug sreug esrug serug reusg erusg ruesg uresg eursg uersg rsueg srueg ruseg urseg sureg usreg esurg seurg eusrg uesrg suerg userg
Note: these 'words' (valid or invalid) are all the permutations of the word gresu. These words are obtained by scrambling the letters in gresu.