refix erfix rfeix freix efrix ferix reifx erifx riefx irefx eirfx ierfx rfiex friex rifex irfex firex ifrex efirx feirx eifrx iefrx fierx iferx refxi erfxi rfexi frexi efrxi ferxi rexfi erxfi rxefi xrefi exrfi xerfi rfxei frxei rxfei xrfei fxrei xfrei efxri fexri exfri xefri fxeri xferi reixf erixf riexf irexf eirxf ierxf rexif erxif rxeif xreif exrif xerif rixef irxef rxief xrief ixref xiref eixrf iexrf exirf xeirf ixerf xierf rfixe frixe rifxe irfxe firxe ifrxe rfxie frxie rxfie xrfie fxrie xfrie rixfe irxfe rxife xrife ixrfe xirfe fixre ifxre fxire xfire ixfre xifre efixr feixr eifxr iefxr fiexr ifexr efxir fexir exfir xefir fxeir xfeir eixfr iexfr exifr xeifr ixefr xiefr fixer ifxer fxier xfier ixfer xifer
Note: these 'words' (valid or invalid) are all the permutations of the word refix. These words are obtained by scrambling the letters in refix.