blech lbech belch eblch lebch elbch blceh lbceh bcleh cbleh lcbeh clbeh beclh ebclh bcelh cbelh ecblh ceblh lecbh elcbh lcebh clebh eclbh celbh blehc lbehc belhc eblhc lebhc elbhc blhec lbhec bhlec hblec lhbec hlbec behlc ebhlc bhelc hbelc ehblc heblc lehbc elhbc lhebc hlebc ehlbc helbc blche lbche bclhe cblhe lcbhe clbhe blhce lbhce bhlce hblce lhbce hlbce bchle cbhle bhcle hbcle chble hcble lchbe clhbe lhcbe hlcbe chlbe hclbe bechl ebchl bcehl cbehl ecbhl cebhl behcl ebhcl bhecl hbecl ehbcl hebcl bchel cbhel bhcel hbcel chbel hcbel echbl cehbl ehcbl hecbl chebl hcebl lechb elchb lcehb clehb eclhb celhb lehcb elhcb lhecb hlecb ehlcb helcb lcheb clheb lhceb hlceb chleb hcleb echlb cehlb ehclb heclb chelb hcelb
Note: these 'words' (valid or invalid) are all the permutations of the word blech. These words are obtained by scrambling the letters in blech.