gruel rguel gurel ugrel rugel urgel greul rgeul gerul egrul regul ergul guerl ugerl geurl egurl uegrl eugrl ruegl uregl reugl erugl uergl eurgl grule rgule gurle ugrle rugle urgle grlue rglue glrue lgrue rlgue lrgue gulre uglre glure lgure ulgre lugre rulge urlge rluge lruge ulrge lurge grelu rgelu gerlu egrlu reglu erglu grleu rgleu glreu lgreu rlgeu lrgeu gelru eglru gleru lgeru elgru legru relgu erlgu rlegu lregu elrgu lergu guelr ugelr geulr egulr ueglr euglr guler ugler gluer lguer ulger luger gelur eglur gleur lgeur elgur legur uelgr eulgr ulegr luegr elugr leugr ruelg urelg reulg erulg uerlg eurlg ruleg urleg rlueg lrueg ulreg lureg relug erlug rleug lreug elrug lerug uelrg eulrg ulerg luerg elurg leurg
Note: these 'words' (valid or invalid) are all the permutations of the word gruel. These words are obtained by scrambling the letters in gruel.