ubras buras urbas rubas bruas rbuas ubars buars uabrs aubrs baurs aburs urabs ruabs uarbs aurbs raubs arubs braus rbaus barus abrus rabus arbus ubrsa bursa urbsa rubsa brusa rbusa ubsra busra usbra subra bsura sbura ursba rusba usrba surba rsuba sruba brsua rbsua bsrua sbrua rsbua srbua ubasr buasr uabsr aubsr bausr abusr ubsar busar usbar subar bsuar sbuar uasbr ausbr usabr suabr asubr saubr basur absur bsaur sbaur asbur sabur urasb ruasb uarsb aursb rausb arusb ursab rusab usrab surab rsuab sruab uasrb ausrb usarb suarb asurb saurb rasub arsub rsaub sraub asrub sarub brasu rbasu barsu abrsu rabsu arbsu brsau rbsau bsrau sbrau rsbau srbau basru absru bsaru sbaru asbru sabru rasbu arsbu rsabu srabu asrbu sarbu
Note: these 'words' (valid or invalid) are all the permutations of the word ubras. These words are obtained by scrambling the letters in ubras.