-ous bbbb bbbs bffs bfsr bobb bobo bobs bobu boff bofs bofu boko boks boku boob boof book boor boos bor- borf bork boro borr bors boru bosk boso boss bosu bouf bouk bour bous brfu brkb brob brok broo bror bros brou brrr brrs brsb brsr brus bsff bsfs bsos bubb bubo bubs bubu buff bufo bufr bukk buko buku bur- burb burk buro burr burs buru busk buss busu buus f--k fbrs fbus ffff ffrr ffss fobs fofo foof fook foos for- forb fork foro forr fors fosb foso foss four fous frob fros frou frsb frso frub fsfo fssf fubb fubs fubu fuff fufu fukk fuko fuku fuor fur- furo furr furs fusk fuso fuss fusu k-os kbbb kbbf kbbk kbbo kbbr kbbs kbbu kbfb kbff kbfk kbfo kbfr kbfs kbkb kbkf kbkk kbko kbkr kbob kbok kboo kbos kbrb kbrf kbrk kbro kbru kbsb kbsk kbso kbsr kbss kbsu kbub kbuf kbuk kbur kbus kbuu kfbk kffb kfff kffk kfkb kfok kfoo kfor kfro kfrr kfrs kfru kfsk kfsr kfuo kkbb kkbo kkbr kkbs kkfr kkfs kkkk kkob kkoo kkor kkrb kkrf kkrk kkro kkrr kkrs kksf kksr kkss kksu kkus kkuu kobb kobk kobo kobr kobs kobu koff kofk kofo kofu kokb kokf kokk koko kokr koks koku koob kook kooo koor koos koou korb korf kork koro korr kors koru kos- kosb kosf koso kosr koss kosu koub kour kous kouu krbb krbk krbr krff krfo krfs krkk krko krkr krks krku krob krof krok kroo kror kros krrb krrf krrk krro krrr krrs krsf krsk krsr krss krsu kruf kruk krur ksbr ksbs ksfb ksfo ksfr kskb kskf kskk ksko kskr ksks ksku ksob ksof ksok ksoo ksor ksos ksou ksrb ksrf ksro ksrr ksrs ksso kssr ksss kssu ksub ksuu kubb kubo kubr kubs kubu kuff kufo kufr kukk kuks kuku kuok kuoo kuos kurb kurk kuro kurr kurs kuru kusb kusf kuso kusu kuub kuuk kuur kuuu obbo obkb obok obor obos obro obsr obss obus off- offo offr offs offu ofor ofus okko okok okor okro okso okur okus ooff oofs ooku oooo ooos oous orbb orbo orbs orbu orff orfs orfu orko oro- orof orok oror oros orro orrs orsk orso orsu orub orus osku osoo osor osos osro ossb osso ossu oubs ouff our- ouro ours ouu- rbbb rbbr rbbs rbss rkkf rkos rkss rob- robb robo robs robu roff rofo rokk roko rokr roks roku roob roof rook roor roos rork roro roru roso ross roub rouf rouk rous rrrr rsos rubb rubs rubu ruff rufo rukk ruku ruok ruro rurs ruru rusk ruso russ rusu s-os sbbs sbor sbrk sbus sfor sfos sfro sfss sfsu skor skss skur sobo sobr sobs sobu sofo sokk soko soku soof sook soor soos sorb soro sorr sors soru soso soss souf souk sour sous sros srub ssbr ssrs sssb sssf ssss sub- subb subo subs suf- suff sufr sufs sufu suks suku suor suos sur- surf suro surr surs suru sus- susk suso suss susu suus ubbo ubos ufos ufuk ukko ukok ukur uofo uor- urbs urff uro- urok uroo urso urss ursu uruk urur urus us-k usbr usbs usfs usos ussb ussf ussr usss ussu usus uuuu