fluid lfuid fulid uflid lufid ulfid fliud lfiud filud iflud lifud ilfud fuild ufild fiuld ifuld uifld iufld luifd ulifd liufd ilufd uilfd iulfd fludi lfudi fuldi ufldi lufdi ulfdi fldui lfdui fdlui dflui ldfui dlfui fudli ufdli fduli dfuli udfli dufli ludfi uldfi ldufi dlufi udlfi dulfi flidu lfidu fildu ifldu lifdu ilfdu fldiu lfdiu fdliu dfliu ldfiu dlfiu fidlu ifdlu fdilu dfilu idflu diflu lidfu ildfu ldifu dlifu idlfu dilfu fuidl ufidl fiudl ifudl uifdl iufdl fudil ufdil fduil dfuil udfil dufil fidul ifdul fdiul dfiul idful diful uidfl iudfl udifl duifl idufl diufl luidf ulidf liudf iludf uildf iuldf ludif uldif lduif dluif udlif dulif liduf ilduf ldiuf dliuf idluf diluf uidlf iudlf udilf duilf idulf diulf
Note: these 'words' (valid or invalid) are all the permutations of the word fluid. These words are obtained by scrambling the letters in fluid.