-ous bbbb bbbs bbdd bbdo bd-r bdos bdsd bobb bobo bobs bobu bodb bodo bods bodu boko boks boku boob bood book boor boos bor- bord bork boro borr bors boru bosk boso boss bosu boud bouk bour bous brdo brds brkb brob brod brok broo bror bros brou brrr brrs brsb brsr brud brus bsbd bsod bsos bsrd bssd bubb bubo bubs bubu budb budd budo buds budu bukk buko buku bur- burb burd burk buro burr burs buru busk buss busu buus d-bo dbos dbrs dbss dbus dddd ddss ddub dobb dobs dobu dod- dodd dodo dods doko doob dood dook door doos dord dork doro dorr dors doru dosk doso doss doub doud douk dour dous drob drod drou drrs drub druk drus druu dsdr dsos dsrr dub- dubb dubs dubu dudd dudo duds dudu duku duo- duos durk duro duru dusk duur k-os kbbb kbbd kbbk kbbo kbbr kbbs kbbu kbdb kbdo kbdr kbds kbkb kbkk kbko kbkr kbob kbod kbok kboo kbos kbrb kbrd kbrk kbro kbru kbsb kbsk kbso kbsr kbss kbsu kbub kbud kbuk kbur kbus kbuu kdbb kdbr kdbs kddb kddd kddk kddr kdkb kdkd kdkk kdko kdkr kdok kdrb kdro kdrs kdsd kdsk kdsr kdss kdsu kdub kdur kdus kkbb kkbd kkbo kkbr kkbs kkdd kkdo kkkk kkob kkoo kkor kkrb kkrk kkro kkrr kkrs kksd kksr kkss kksu kkus kkuu kobb kobk kobo kobr kobs kobu kodk kodo kods kodu kokb kokk koko kokr koks koku koob kook kooo koor koos koou korb kord kork koro korr kors koru kos- kosb kosd koso kosr koss kosu koub kour kous kouu krbb krbd krbk krbr krdd krdo krdr krds krdu krkd krkk krko krkr krks krku krob krod krok kroo kror kros krrb krrk krro krrr krrs krsd krsk krsr krss krsu kruk krur ksbr ksbs ksdk ksdr ksds kskb kskd kskk ksko kskr ksks ksku ksob ksok ksoo ksor ksos ksou ksrb ksro ksrr ksrs ksso kssr ksss kssu ksub ksud ksuu kubb kubd kubo kubr kubs kubu kudd kudo kudu kukk kuks kuku kuok kuoo kuos kurb kurd kurk kuro kurr kurs kuru kusb kusd kuso kusu kuub kuuk kuur kuuu obbo obkb obok obor obos obro obsd obsr obss obus odbo oddd odds odoo odor odos odou odso odur odus okko okok okor okro okso okur okus ooku oooo ooos oord oous orbb orbo orbs orbu ordo ords ordu orko oro- orok oror oros orro orrs orsk orso orsu orub orus osku osoo osor osos osrd osro ossb ossd osso ossu oubs ouds our- ouro ours ousd ouu- rbbb rbbr rbbs rbds rbsd rbss rdos rdso rkos rkss rob- robb robo robs robu rodd rodo rods rokk roko rokr roks roku roob rood rook roor roos rork roro roru roso ross roub roud rouk rous rrrr rsdd rsds rsos rubb rubs rubu rudd rudo ruds rukk ruku ruok rurd ruro rurs ruru rusk ruso russ rusu ruud s-os sbbs sbds sbor sbrk sbsd sbus sdds sdrs sdss sdsu skor sksd skss skud skur sobo sobr sobs sobu sodd sodo sods sodu sokk soko soku sood sook soor soos sorb sord soro sorr sors soru soso soss soud souk sour sous sros srsd srub ssbr ssdd ssrs sssb ssss sub- subb subd subo subs sudd sudo suds suks suku suor suos sur- surd suro surr surs suru sus- susd susk suso suss susu suus ubbo ubod ubos ubud udds udoo udos udsd uduk ukko ukok ukur uor- urbs urds urdu uro- urok uroo urso urss ursu uruk urur urus us-k usbr usbs usdo usds usos ussb ussr usss ussu usus uuuu