buhrs ubhrs bhurs hburs uhbrs hubrs burhs ubrhs bruhs rbuhs urbhs rubhs bhrus hbrus brhus rbhus hrbus rhbus uhrbs hurbs urhbs ruhbs hrubs rhubs buhsr ubhsr bhusr hbusr uhbsr hubsr bushr ubshr bsuhr sbuhr usbhr subhr bhsur hbsur bshur sbhur hsbur shbur uhsbr husbr ushbr suhbr hsubr shubr bursh ubrsh brush rbush urbsh rubsh busrh ubsrh bsurh sburh usbrh subrh brsuh rbsuh bsruh sbruh rsbuh srbuh ursbh rusbh usrbh surbh rsubh srubh bhrsu hbrsu brhsu rbhsu hrbsu rhbsu bhsru hbsru bshru sbhru hsbru shbru brshu rbshu bsrhu sbrhu rsbhu srbhu hrsbu rhsbu hsrbu shrbu rshbu srhbu uhrsb hursb urhsb ruhsb hrusb rhusb uhsrb husrb ushrb suhrb hsurb shurb urshb rushb usrhb surhb rsuhb sruhb hrsub rhsub hsrub shrub rshub srhub
Note: these 'words' (valid or invalid) are all the permutations of the word buhrs. These words are obtained by scrambling the letters in buhrs.