urbsub rubsub ubrsub bursub rbusub brusub ursbub rusbub usrbub surbub rsubub srubub ubsrub busrub usbrub subrub bsurub sburub rbsuub brsuub rsbuub srbuub bsruub sbruub urbusb rubusb ubrusb burusb rbuusb bruusb urubsb ruubsb uurbsb uurbsb ruubsb urubsb ubursb buursb uubrsb uubrsb buursb ubursb rbuusb bruusb rubusb urbusb burusb ubrusb ursubb rusubb usrubb surubb rsuubb sruubb urusbb ruusbb uursbb uursbb ruusbb urusbb usurbb suurbb uusrbb uusrbb suurbb usurbb rsuubb sruubb rusubb ursubb surubb usrubb ubsurb busurb usburb suburb bsuurb sbuurb ubusrb buusrb uubsrb uubsrb buusrb ubusrb usubrb suubrb uusbrb uusbrb suubrb usubrb bsuurb sbuurb busurb ubsurb suburb usburb rbsuub brsuub rsbuub srbuub bsruub sbruub rbusub brusub rubsub urbsub bursub ubrsub rsubub srubub rusbub ursbub surbub usrbub bsurub sburub busrub ubsrub subrub usbrub urbsbu rubsbu ubrsbu bursbu rbusbu brusbu ursbbu rusbbu usrbbu surbbu rsubbu srubbu ubsrbu busrbu usbrbu subrbu bsurbu sburbu rbsubu brsubu rsbubu srbubu bsrubu sbrubu urbbsu rubbsu ubrbsu burbsu rbubsu brubsu urbbsu rubbsu ubrbsu burbsu rbubsu brubsu ubbrsu bubrsu ubbrsu bubrsu bbursu bbursu rbbusu brbusu rbbusu brbusu bbrusu bbrusu ursbbu rusbbu usrbbu surbbu rsubbu srubbu urbsbu rubsbu ubrsbu bursbu rbusbu brusbu usbrbu subrbu ubsrbu busrbu sburbu bsurbu rsbubu srbubu rbsubu brsubu sbrubu bsrubu ubsbru busbru usbbru subbru bsubru sbubru ubbsru bubsru ubbsru bubsru bbusru bbusru usbbru subbru ubsbru busbru sbubru bsubru bsburu sbburu bbsuru bbsuru sbburu bsburu rbsbuu brsbuu rsbbuu srbbuu bsrbuu sbrbuu rbbsuu brbsuu rbbsuu brbsuu bbrsuu bbrsuu rsbbuu srbbuu rbsbuu brsbuu sbrbuu bsrbuu bsbruu sbbruu bbsruu bbsruu sbbruu bsbruu urbubs rububs ubrubs burubs rbuubs bruubs urubbs ruubbs uurbbs uurbbs ruubbs urubbs uburbs buurbs uubrbs uubrbs buurbs uburbs rbuubs bruubs rububs urbubs burubs ubrubs urbbus rubbus ubrbus burbus rbubus brubus urbbus rubbus ubrbus burbus rbubus brubus ubbrus bubrus ubbrus bubrus bburus bburus rbbuus brbuus rbbuus brbuus bbruus bbruus urubbs ruubbs uurbbs uurbbs ruubbs urubbs urbubs rububs ubrubs burubs rbuubs bruubs uubrbs uubrbs uburbs buurbs uburbs buurbs rububs urbubs rbuubs bruubs ubrubs burubs ububrs buubrs uubbrs uubbrs buubrs ububrs ubburs buburs ubburs buburs bbuurs bbuurs uubbrs uubbrs ububrs buubrs ububrs buubrs buburs ubburs bbuurs bbuurs ubburs buburs rbubus brubus rubbus urbbus burbus ubrbus rbbuus brbuus rbbuus brbuus bbruus bbruus rubbus urbbus rbubus brubus ubrbus burbus bubrus ubbrus bburus bburus ubbrus bubrus ursubb rusubb usrubb surubb rsuubb sruubb urusbb ruusbb uursbb uursbb ruusbb urusbb usurbb suurbb uusrbb uusrbb suurbb usurbb rsuubb sruubb rusubb ursubb surubb usrubb ursbub rusbub usrbub surbub rsubub srubub urbsub rubsub ubrsub bursub rbusub brusub usbrub subrub ubsrub busrub sburub bsurub rsbuub srbuub rbsuub brsuub sbruub bsruub urubsb ruubsb uurbsb uurbsb ruubsb urubsb urbusb rubusb ubrusb burusb rbuusb bruusb uubrsb uubrsb ubursb buursb ubursb buursb rubusb urbusb rbuusb bruusb ubrusb burusb usubrb suubrb uusbrb uusbrb suubrb usubrb usburb suburb ubsurb busurb sbuurb bsuurb uubsrb uubsrb ubusrb buusrb ubusrb buusrb suburb usburb sbuurb bsuurb ubsurb busurb rsubub srubub rusbub ursbub surbub usrbub rsbuub srbuub rbsuub brsuub sbruub bsruub rubsub urbsub rbusub brusub ubrsub bursub subrub usbrub sburub bsurub ubsrub busrub ubsubr busubr usbubr sububr bsuubr sbuubr ubusbr buusbr uubsbr uubsbr buusbr ubusbr usubbr suubbr uusbbr uusbbr suubbr usubbr bsuubr sbuubr busubr ubsubr sububr usbubr ubsbur busbur usbbur subbur bsubur sbubur ubbsur bubsur ubbsur bubsur bbusur bbusur usbbur subbur ubsbur busbur sbubur bsubur bsbuur sbbuur bbsuur bbsuur sbbuur bsbuur ububsr buubsr uubbsr uubbsr buubsr ububsr ubbusr bubusr ubbusr bubusr bbuusr bbuusr uubbsr uubbsr ububsr buubsr ububsr buubsr bubusr ubbusr bbuusr bbuusr ubbusr bubusr usubbr suubbr uusbbr uusbbr suubbr usubbr usbubr sububr ubsubr busubr sbuubr bsuubr uubsbr uubsbr ubusbr buusbr ubusbr buusbr sububr usbubr sbuubr bsuubr ubsubr busubr bsubur sbubur busbur ubsbur subbur usbbur bsbuur sbbuur bbsuur bbsuur sbbuur bsbuur bubsur ubbsur bbusur bbusur ubbsur bubsur subbur usbbur sbubur bsubur ubsbur busbur rbsubu brsubu rsbubu srbubu bsrubu sbrubu rbusbu brusbu rubsbu urbsbu bursbu ubrsbu rsubbu srubbu rusbbu ursbbu surbbu usrbbu bsurbu sburbu busrbu ubsrbu subrbu usbrbu rbsbuu brsbuu rsbbuu srbbuu bsrbuu sbrbuu rbbsuu brbsuu rbbsuu brbsuu bbrsuu bbrsuu rsbbuu srbbuu rbsbuu brsbuu sbrbuu bsrbuu bsbruu sbbruu bbsruu bbsruu sbbruu bsbruu rbubsu brubsu rubbsu urbbsu burbsu ubrbsu rbbusu brbusu rbbusu brbusu bbrusu bbrusu rubbsu urbbsu rbubsu brubsu ubrbsu burbsu bubrsu ubbrsu bbursu bbursu ubbrsu bubrsu rsubbu srubbu rusbbu ursbbu surbbu usrbbu rsbubu srbubu rbsubu brsubu sbrubu bsrubu rubsbu urbsbu rbusbu brusbu ubrsbu bursbu subrbu usbrbu sburbu bsurbu ubsrbu busrbu bsubru sbubru busbru ubsbru subbru usbbru bsburu sbburu bbsuru bbsuru sbburu bsburu bubsru ubbsru bbusru bbusru ubbsru bubsru subbru usbbru sbubru bsubru ubsbru busbru
Note: these 'words' (valid or invalid) are all the permutations of the word urbsub. These words are obtained by scrambling the letters in urbsub.