igdfr gidfr idgfr digfr gdifr dgifr igfdr gifdr ifgdr figdr gfidr fgidr idfgr difgr ifdgr fidgr dfigr fdigr gdfir dgfir gfdir fgdir dfgir fdgir igdrf gidrf idgrf digrf gdirf dgirf igrdf girdf irgdf rigdf gridf rgidf idrgf dirgf irdgf ridgf drigf rdigf gdrif dgrif grdif rgdif drgif rdgif igfrd gifrd ifgrd figrd gfird fgird igrfd girfd irgfd rigfd grifd rgifd ifrgd firgd irfgd rifgd frigd rfigd gfrid fgrid grfid rgfid frgid rfgid idfrg difrg ifdrg fidrg dfirg fdirg idrfg dirfg irdfg ridfg drifg rdifg ifrdg firdg irfdg rifdg fridg rfidg dfrig fdrig drfig rdfig frdig rfdig gdfri dgfri gfdri fgdri dfgri fdgri gdrfi dgrfi grdfi rgdfi drgfi rdgfi gfrdi fgrdi grfdi rgfdi frgdi rfgdi dfrgi fdrgi drfgi rdfgi frdgi rfdgi
Note: these 'words' (valid or invalid) are all the permutations of the word igdfr. These words are obtained by scrambling the letters in igdfr.