redid erdid rdeid dreid edrid derid reidd eridd riedd iredd eirdd ierdd rdied dried rided irded dired idred edird deird eidrd iedrd dierd iderd reddi erddi rdedi dredi edrdi derdi reddi erddi rdedi dredi edrdi derdi rddei drdei rddei drdei ddrei ddrei eddri dedri eddri dedri dderi dderi reidd eridd riedd iredd eirdd ierdd redid erdid rdeid dreid edrid derid rided irded rdied dried idred dired eidrd iedrd edird deird iderd dierd rdide dride ridde irdde dirde idrde rddie drdie rddie drdie ddrie ddrie ridde irdde rdide dride idrde dirde didre iddre ddire ddire iddre didre edidr deidr eiddr ieddr diedr idedr eddir dedir eddir dedir ddeir ddeir eiddr ieddr edidr deidr idedr diedr dider idder ddier ddier idder dider
Note: these 'words' (valid or invalid) are all the permutations of the word redid. These words are obtained by scrambling the letters in redid.