unfed nufed ufned funed nfued fnued unefd nuefd uenfd eunfd neufd enufd ufend fuend uefnd eufnd feund efund nfeud fneud nefud enfud fenud efnud unfde nufde ufnde funde nfude fnude undfe nudfe udnfe dunfe ndufe dnufe ufdne fudne udfne dufne fdune dfune nfdue fndue ndfue dnfue fdnue dfnue unedf nuedf uendf eundf neudf enudf undef nudef udnef dunef nduef dnuef uednf eudnf udenf duenf edunf deunf neduf enduf ndeuf dneuf ednuf denuf ufedn fuedn uefdn eufdn feudn efudn ufden fuden udfen dufen fduen dfuen uedfn eudfn udefn duefn edufn deufn fedun efdun fdeun dfeun edfun defun nfedu fnedu nefdu enfdu fendu efndu nfdeu fndeu ndfeu dnfeu fdneu dfneu nedfu endfu ndefu dnefu ednfu denfu fednu efdnu fdenu dfenu edfnu defnu
Note: these 'words' (valid or invalid) are all the permutations of the word unfed. These words are obtained by scrambling the letters in unfed.