rofer orfer rfoer froer ofrer forer roefr orefr reofr erofr oerfr eorfr rfeor freor refor erfor feror efror oferr foerr oefrr eofrr feorr eforr rofre orfre rfore frore ofrre forre rorfe orrfe rrofe rrofe orrfe rorfe rfroe frroe rrfoe rrfoe frroe rfroe ofrre forre orfre rofre frore rfore roerf orerf reorf erorf oerrf eorrf roref orref rroef rroef orref roref rerof errof rreof rreof errof rerof oerrf eorrf orerf roerf erorf reorf rfero frero refro erfro ferro efrro rfreo frreo rrfeo rrfeo frreo rfreo rerfo errfo rrefo rrefo errfo rerfo ferro efrro frero rfero erfro refro oferr foerr oefrr eofrr feorr eforr ofrer forer orfer rofer froer rfoer oerfr eorfr orefr roefr erofr reofr feror efror freor rfeor erfor refor
Note: these 'words' (valid or invalid) are all the permutations of the word rofer. These words are obtained by scrambling the letters in rofer.