flexo lfexo felxo eflxo lefxo elfxo flxeo lfxeo fxleo xfleo lxfeo xlfeo fexlo efxlo fxelo xfelo exflo xeflo lexfo elxfo lxefo xlefo exlfo xelfo fleox lfeox felox eflox lefox elfox floex lfoex folex oflex lofex olfex feolx efolx foelx ofelx eoflx oeflx leofx elofx loefx olefx eolfx oelfx flxoe lfxoe fxloe xfloe lxfoe xlfoe floxe lfoxe folxe oflxe lofxe olfxe fxole xfole foxle ofxle xofle oxfle lxofe xlofe loxfe olxfe xolfe oxlfe fexol efxol fxeol xfeol exfol xefol feoxl efoxl foexl ofexl eofxl oefxl fxoel xfoel foxel ofxel xofel oxfel exofl xeofl eoxfl oexfl xoefl oxefl lexof elxof lxeof xleof exlof xelof leoxf eloxf loexf olexf eolxf oelxf lxoef xloef loxef olxef xolef oxlef exolf xeolf eoxlf oexlf xoelf oxelf
Note: these 'words' (valid or invalid) are all the permutations of the word flexo. These words are obtained by scrambling the letters in flexo.