rubes urbes rbues brues ubres bures ruebs urebs reubs erubs uerbs eurbs rbeus breus rebus erbus berus ebrus ubers buers uebrs eubrs beurs eburs rubse urbse rbuse bruse ubrse burse rusbe ursbe rsube srube usrbe surbe rbsue brsue rsbue srbue bsrue sbrue ubsre busre usbre subre bsure sbure ruesb uresb reusb erusb uersb eursb ruseb urseb rsueb srueb usreb sureb resub ersub rseub sreub esrub serub uesrb eusrb userb suerb esurb seurb rbesu bresu rebsu erbsu bersu ebrsu rbseu brseu rsbeu srbeu bsreu sbreu resbu ersbu rsebu srebu esrbu serbu besru ebsru bseru sberu esbru sebru ubesr buesr uebsr eubsr beusr ebusr ubser buser usber suber bsuer sbuer uesbr eusbr usebr suebr esubr seubr besur ebsur bseur sbeur esbur sebur
Note: these 'words' (valid or invalid) are all the permutations of the word rubes. These words are obtained by scrambling the letters in rubes.