-ous bbbb bbbs bbwr bbws bobb bobo bobs bobu bobw boko boks boku boob book boor boos boow bor- bork boro borr bors boru borw bosk boso boss bosu bouk bour bous bouw bowk bowr bows brkb brob brok broo bror bros brou brow brrr brrs brsb brsr brus bsos bubb bubo bubs bubu bukk buko buku bur- burb burk buro burr burs buru busk buss busu buus k-os kbbb kbbk kbbo kbbr kbbs kbbu kbbw kbkb kbkk kbko kbkr kbkw kbob kbok kboo kbos kbow kbrb kbrk kbro kbru kbrw kbsb kbsk kbso kbsr kbss kbsu kbsw kbub kbuk kbur kbus kbuu kbuw kbwb kbww kkbb kkbo kkbr kkbs kkkk kkob kkoo kkor kkow kkrb kkrk kkro kkrr kkrs kksr kkss kksu kksw kkus kkuu kkwb kkwk kkws kobb kobk kobo kobr kobs kobu kokb kokk koko kokr koks koku koob kook kooo koor koos koou korb kork koro korr kors koru kos- kosb koso kosr koss kosu koub kour kous kouu kouw kowb kowr krbb krbk krbr krbw krkk krko krkr krks krku krkw krob krok kroo kror kros krow krrb krrk krro krrr krrs krrw krsk krsr krss krsu krsw kruk krur krwb krwk krwr ksbr ksbs ksbw kskb kskk ksko kskr ksks ksku ksob ksok ksoo ksor ksos ksou ksow ksrb ksro ksrr ksrs ksrw ksso kssr ksss kssu ksub ksuu ksuw kswb kswo ksws ksww kubb kubo kubr kubs kubu kukk kuks kuku kuok kuoo kuos kuow kurb kurk kuro kurr kurs kuru kusb kuso kusu kusw kuub kuuk kuur kuuu kuwr kuws kuww kwbu kwbw kwkb kwkk kwkr kwkw kwok kwor kwos kwow kwrb kwrk kwro kwrr kwrs kwru kwrw kwsk kwso kwss kwsu kwsw kwub kwur kwwk kwwr kwws obbo obkb obok obor obos obro obsr obss obus okko okok okor okro okso okur okus ooku oooo ooos oous orbb orbo orbs orbu orko oro- orok oror oros orro orrs orsk orso orsu orub orus orwo osku osoo osor osos osow osro ossb osso ossu oubs our- ouro ours ouu- owow owur rbbb rbbr rbbs rbss rkos rkss rob- robb robo robs robu rokk roko rokr roks roku roob rook roor roos rork roro roru roso ross roub rouk rous rowb rowk rowr rows roww rrrr rsos rubb rubs rubu rukk ruku ruok ruro rurs ruru rusk ruso russ rusu s-os sbbs sbor sbrk sbus sbwr skor skow skss skur skws sobo sobr sobs sobu sokk soko soku sook soor soos sorb soro sorr sors soru soso soss souk sour sous sowk sowr sows sros srub ssbr ssrs sssb ssss ssws sub- subb subo subs suks suku suor suos sur- suro surr surs suru sus- susk suso suss susu suus suwu swbs swbw swob swoo swor swow swss ubbo ubos ukko ukok uksw ukur uor- urbs uro- urok uroo urso urss ursu uruk urur urus us-k usbr usbs usos ussb ussr usss ussu usus uuuu wbbb wbbk wbbo wbbr wbbs wbbw wbkb wbkk wbko wbkr wbks wbku wbkw wbob wbok wbor wbos wbow wbrb wbrk wbrr wbrs wbru wbrw wbsb wbsr wbss wbsu wbsw wbuk wbus wbuw wbwb wbwo wkbk wkbo wkbu wkbw wkkb wkko wkkr wkks wkkw wkok wkoo wkor wkos wkow wkrb wkrk wkro wkrr wkrs wkru wksb wksk wkso wksr wkss wksu wksw wkub wkws wobb wobo wokb wokk woko wokr woks woku wokw woob wook woos woow worb work woro worr wors worw woso woss wosu wosw woub wouk wour wous wouw wowb wowo wows woww wrbb wrbk wrbo wrbs wrbu wrbw wrkb wrkk wrko wrkr wrks wrku wrkw wrob wrok wroo wros wrow wrrb wrrk wrro wrrs wrrw wrsb wrso wrsr wrss wrsw wrub wrus wrwb wrwr wsbb wsbk wsbr wsbs wsbu wsbw wskb wskk wsko wskr wsku wskw wsob wsok wsoo wsor wsos wsou wsrb wsrk wsro wsrs wsru wsrw wssr wsss wssu wssw wsur wsus wsuw wswb wswr wsws wsww wubb wubr wubu wukb wuks wur- wurb wusb wuso wusr wuss wusu wusw wuub wuuu wwbb wwbr wwbu wwkb wwkr wwks wwku wwor wwos wwow wwrb wwrk wwrr wwru wwrw wwsb wwsk wwsr wwss wwsu wwus wwwk wwwr wwws wwww