gurbs ugrbs grubs rgubs urgbs rugbs gubrs ugbrs gburs bgurs ubgrs bugrs grbus rgbus gbrus bgrus rbgus brgus urbgs rubgs ubrgs burgs rbugs brugs gursb ugrsb grusb rgusb urgsb rugsb gusrb ugsrb gsurb sgurb usgrb sugrb grsub rgsub gsrub sgrub rsgub srgub ursgb rusgb usrgb surgb rsugb srugb gubsr ugbsr gbusr bgusr ubgsr bugsr gusbr ugsbr gsubr sgubr usgbr sugbr gbsur bgsur gsbur sgbur bsgur sbgur ubsgr busgr usbgr subgr bsugr sbugr grbsu rgbsu gbrsu bgrsu rbgsu brgsu grsbu rgsbu gsrbu sgrbu rsgbu srgbu gbsru bgsru gsbru sgbru bsgru sbgru rbsgu brsgu rsbgu srbgu bsrgu sbrgu urbsg rubsg ubrsg bursg rbusg brusg ursbg rusbg usrbg surbg rsubg srubg ubsrg busrg usbrg subrg bsurg sburg rbsug brsug rsbug srbug bsrug sbrug
Note: these 'words' (valid or invalid) are all the permutations of the word gurbs. These words are obtained by scrambling the letters in gurbs.