slurb lsurb sulrb uslrb lusrb ulsrb slrub lsrub srlub rslub lrsub rlsub surlb usrlb srulb rsulb urslb ruslb lursb ulrsb lrusb rlusb urlsb rulsb slubr lsubr sulbr uslbr lusbr ulsbr slbur lsbur sblur bslur lbsur blsur sublr usblr sbulr bsulr ubslr buslr lubsr ulbsr lbusr blusr ublsr bulsr slrbu lsrbu srlbu rslbu lrsbu rlsbu slbru lsbru sblru bslru lbsru blsru srblu rsblu sbrlu bsrlu rbslu brslu lrbsu rlbsu lbrsu blrsu rblsu brlsu surbl usrbl srubl rsubl ursbl rusbl subrl usbrl sburl bsurl ubsrl busrl srbul rsbul sbrul bsrul rbsul brsul urbsl rubsl ubrsl bursl rbusl brusl lurbs ulrbs lrubs rlubs urlbs rulbs lubrs ulbrs lburs blurs ublrs bulrs lrbus rlbus lbrus blrus rblus brlus urbls rubls ubrls burls rbuls bruls
Note: these 'words' (valid or invalid) are all the permutations of the word slurb. These words are obtained by scrambling the letters in slurb.