rubus urbus rbuus bruus ubrus burus ruubs urubs ruubs urubs uurbs uurbs rbuus bruus rubus urbus burus ubrus uburs buurs uubrs uubrs buurs uburs rubsu urbsu rbusu brusu ubrsu bursu rusbu ursbu rsubu srubu usrbu surbu rbsuu brsuu rsbuu srbuu bsruu sbruu ubsru busru usbru subru bsuru sburu ruusb urusb ruusb urusb uursb uursb rusub ursub rsuub sruub usrub surub rusub ursub rsuub sruub usrub surub uusrb uusrb usurb suurb usurb suurb rbusu brusu rubsu urbsu bursu ubrsu rbsuu brsuu rsbuu srbuu bsruu sbruu rusbu ursbu rsubu srubu usrbu surbu busru ubsru bsuru sburu usbru subru ubusr buusr uubsr uubsr buusr ubusr ubsur busur usbur subur bsuur sbuur uusbr uusbr usubr suubr usubr suubr busur ubsur bsuur sbuur usbur subur
Note: these 'words' (valid or invalid) are all the permutations of the word rubus. These words are obtained by scrambling the letters in rubus.