ushbl suhbl uhsbl husbl shubl hsubl usbhl subhl ubshl bushl sbuhl bsuhl uhbsl hubsl ubhsl buhsl hbusl bhusl shbul hsbul sbhul bshul hbsul bhsul ushlb suhlb uhslb huslb shulb hsulb uslhb sulhb ulshb lushb sluhb lsuhb uhlsb hulsb ulhsb luhsb hlusb lhusb shlub hslub slhub lshub hlsub lhsub usblh sublh ubslh buslh sbulh bsulh uslbh sulbh ulsbh lusbh slubh lsubh ublsh bulsh ulbsh lubsh blush lbush sbluh bsluh slbuh lsbuh blsuh lbsuh uhbls hubls ubhls buhls hbuls bhuls uhlbs hulbs ulhbs luhbs hlubs lhubs ublhs bulhs ulbhs lubhs bluhs lbuhs hblus bhlus hlbus lhbus blhus lbhus shblu hsblu sbhlu bshlu hbslu bhslu shlbu hslbu slhbu lshbu hlsbu lhsbu sblhu bslhu slbhu lsbhu blshu lbshu hblsu bhlsu hlbsu lhbsu blhsu lbhsu
Note: these 'words' (valid or invalid) are all the permutations of the word ushbl. These words are obtained by scrambling the letters in ushbl.