cuber ucber cbuer bcuer ubcer bucer cuebr ucebr ceubr ecubr uecbr eucbr cbeur bceur cebur ecbur becur ebcur ubecr buecr uebcr eubcr beucr ebucr cubre ucbre cbure bcure ubcre bucre curbe ucrbe crube rcube urcbe rucbe cbrue bcrue crbue rcbue brcue rbcue ubrce burce urbce rubce bruce rbuce cuerb ucerb ceurb ecurb uecrb eucrb cureb ucreb crueb rcueb urceb ruceb cerub ecrub creub rceub ercub recub uercb eurcb urecb ruecb erucb reucb cberu bceru cebru ecbru becru ebcru cbreu bcreu crbeu rcbeu brceu rbceu cerbu ecrbu crebu rcebu ercbu recbu bercu ebrcu brecu rbecu erbcu rebcu uberc buerc uebrc eubrc beurc eburc ubrec burec urbec rubec bruec rbuec uerbc eurbc urebc ruebc erubc reubc beruc ebruc breuc rbeuc erbuc rebuc
Note: these 'words' (valid or invalid) are all the permutations of the word cuber. These words are obtained by scrambling the letters in cuber.