rifed irfed rfied fried ifred fired riefd irefd reifd erifd ierfd eirfd rfeid freid refid erfid ferid efrid iferd fierd iefrd eifrd feird efird rifde irfde rfide fride ifrde firde ridfe irdfe rdife drife idrfe dirfe rfdie frdie rdfie drfie fdrie dfrie ifdre fidre idfre difre fdire dfire riedf iredf reidf eridf ierdf eirdf ridef irdef rdief drief idref diref redif erdif rdeif dreif edrif derif iedrf eidrf iderf dierf edirf deirf rfedi fredi refdi erfdi ferdi efrdi rfdei frdei rdfei drfei fdrei dfrei redfi erdfi rdefi drefi edrfi derfi fedri efdri fderi dferi edfri defri ifedr fiedr iefdr eifdr feidr efidr ifder fider idfer difer fdier dfier iedfr eidfr idefr diefr edifr deifr fedir efdir fdeir dfeir edfir defir
Note: these 'words' (valid or invalid) are all the permutations of the word rifed. These words are obtained by scrambling the letters in rifed.