idfwe difwe ifdwe fidwe dfiwe fdiwe idwfe diwfe iwdfe widfe dwife wdife ifwde fiwde iwfde wifde fwide wfide dfwie fdwie dwfie wdfie fwdie wfdie idfew difew ifdew fidew dfiew fdiew idefw diefw iedfw eidfw deifw edifw ifedw fiedw iefdw eifdw feidw efidw dfeiw fdeiw defiw edfiw fediw efdiw idwef diwef iwdef widef dwief wdief idewf diewf iedwf eidwf deiwf ediwf iwedf wiedf iewdf eiwdf weidf ewidf dweif wdeif dewif edwif wedif ewdif ifwed fiwed iwfed wifed fwied wfied ifewd fiewd iefwd eifwd feiwd efiwd iwefd wiefd iewfd eiwfd weifd ewifd fweid wfeid fewid efwid wefid ewfid dfwei fdwei dwfei wdfei fwdei wfdei dfewi fdewi defwi edfwi fedwi efdwi dwefi wdefi dewfi edwfi wedfi ewdfi fwedi wfedi fewdi efwdi wefdi ewfdi
Note: these 'words' (valid or invalid) are all the permutations of the word idfwe. These words are obtained by scrambling the letters in idfwe.