flexi lfexi felxi eflxi lefxi elfxi flxei lfxei fxlei xflei lxfei xlfei fexli efxli fxeli xfeli exfli xefli lexfi elxfi lxefi xlefi exlfi xelfi fleix lfeix felix eflix lefix elfix fliex lfiex filex iflex lifex ilfex feilx efilx fielx ifelx eiflx ieflx leifx elifx liefx ilefx eilfx ielfx flxie lfxie fxlie xflie lxfie xlfie flixe lfixe filxe iflxe lifxe ilfxe fxile xfile fixle ifxle xifle ixfle lxife xlife lixfe ilxfe xilfe ixlfe fexil efxil fxeil xfeil exfil xefil feixl efixl fiexl ifexl eifxl iefxl fxiel xfiel fixel ifxel xifel ixfel exifl xeifl eixfl iexfl xiefl ixefl lexif elxif lxeif xleif exlif xelif leixf elixf liexf ilexf eilxf ielxf lxief xlief lixef ilxef xilef ixlef exilf xeilf eixlf iexlf xielf ixelf
Note: these 'words' (valid or invalid) are all the permutations of the word flexi. These words are obtained by scrambling the letters in flexi.