xtabs txabs xatbs axtbs taxbs atxbs xtbas txbas xbtas bxtas tbxas btxas xabts axbts xbats bxats abxts baxts tabxs atbxs tbaxs btaxs abtxs batxs xtasb txasb xatsb axtsb taxsb atxsb xtsab txsab xstab sxtab tsxab stxab xastb axstb xsatb sxatb asxtb saxtb tasxb atsxb tsaxb staxb astxb satxb xtbsa txbsa xbtsa bxtsa tbxsa btxsa xtsba txsba xstba sxtba tsxba stxba xbsta bxsta xsbta sxbta bsxta sbxta tbsxa btsxa tsbxa stbxa bstxa sbtxa xabst axbst xbast bxast abxst baxst xasbt axsbt xsabt sxabt asxbt saxbt xbsat bxsat xsbat sxbat bsxat sbxat absxt basxt asbxt sabxt bsaxt sbaxt tabsx atbsx tbasx btasx abtsx batsx tasbx atsbx tsabx stabx astbx satbx tbsax btsax tsbax stbax bstax sbtax abstx bastx asbtx sabtx bsatx sbatx
Note: these 'words' (valid or invalid) are all the permutations of the word xtabs. These words are obtained by scrambling the letters in xtabs.