fifed iffed ffied ffied iffed fifed fiefd ifefd feifd efifd ieffd eiffd ffeid ffeid fefid effid fefid effid ifefd fiefd ieffd eiffd feifd efifd fifde iffde ffide ffide iffde fifde fidfe ifdfe fdife dfife idffe diffe ffdie ffdie fdfie dffie fdfie dffie ifdfe fidfe idffe diffe fdife dfife fiedf ifedf feidf efidf iefdf eifdf fidef ifdef fdief dfief idfef difef fedif efdif fdeif dfeif edfif defif iedff eidff ideff dieff ediff deiff ffedi ffedi fefdi effdi fefdi effdi ffdei ffdei fdfei dffei fdfei dffei fedfi efdfi fdefi dfefi edffi deffi fedfi efdfi fdefi dfefi edffi deffi ifedf fiedf iefdf eifdf feidf efidf ifdef fidef idfef difef fdief dfief iedff eidff ideff dieff ediff deiff fedif efdif fdeif dfeif edfif defif
Note: these 'words' (valid or invalid) are all the permutations of the word fifed. These words are obtained by scrambling the letters in fifed.