-ous bbbb bbbs bbrg bggs bobb bobo bobs bobu bogg bogo bogs boko boks boku boob boog book boor boos bor- borg bork boro borr bors boru bosk boso boss bosu bouk bour bous brkb brob brog brok broo bror bros brou brrr brrs brsb brsr brug brus bsgs bsos bubb bubo bubs bubu bugg bugo bugs bukk buko buku bur- burb burg burk buro burr burs buru busk buss busu buus gbbo gbbs gggg ggss gobo gobs gogo gogs goku goog gook goor goos gorb gorg goro gorr gors goso goss gosu gou- goug gouk gour gous grbr grob grog grok groo gror gros grou grrr grrs grss grub grug grur grus gskb gsos gsur gubb gubs gubu gugb gugg gugu guos gurb gurg gurk guro gurr gurs guru gusb guss guus k-os kbbb kbbg kbbk kbbo kbbr kbbs kbbu kbgb kbgg kbgo kbgr kbkb kbkg kbkk kbko kbkr kbob kbok kboo kbos kbrb kbrg kbrk kbro kbru kbsb kbsg kbsk kbso kbsr kbss kbsu kbub kbuk kbur kbus kbuu kgbb kgbr kggg kggo kggr kgks kgor kgos kgou kgrb kgrg kgrk kgro kgrr kgrs kgso kgsr kgus kkbb kkbg kkbo kkbr kkbs kkgb kkgo kkgr kkkk kkob kkoo kkor kkrb kkrk kkro kkrr kkrs kksr kkss kksu kkus kkuu kobb kobk kobo kobr kobs kobu kogb kogg kogo kogu kokb kokk koko kokr koks koku koob koog kook kooo koor koos koou korb korg kork koro korr kors koru kos- kosb kosg koso kosr koss kosu koub kour kous kouu krbb krbg krbk krbr krgs krkk krko krkr krks krku krob krog krok kroo kror kros krrb krrg krrk krro krrr krrs krsk krsr krss krsu krug kruk krur ksbr ksbs ksgg ksgr ksgu kskb kskg kskk ksko kskr ksks ksku ksob ksok ksoo ksor ksos ksou ksrb ksrg ksro ksrr ksrs ksso kssr ksss kssu ksub ksug ksuu kubb kubo kubr kubs kubu kugb kugo kugr kugs kukk kuks kuku kuok kuoo kuos kurb kurk kuro kurr kurs kuru kusb kusg kuso kusu kuub kuuk kuur kuuu obbo obkb obok obor obos obro obsr obss obus ogb ogog ogou ogro ogus okgo okko okok okor okro okso okur okus ooku oooo ooos oous orbb orbo orbs orbu orgo orgs orko oro- orok oror oros orro orrs orsk orso orsu orub orus osku osoo osor osos osro ossb osso ossu oubs our- ouro ours ouu- rbbb rbbr rbbs rbss rkos rkss rob- robb robo robs robu rogg rogo rokk roko rokr roks roku roob roog rook roor roos rork roro roru roso ross roub rouk rous rrrr rsgb rsos rubb rubs rubu rugg rugs rukk ruku ruok ruro rurs ruru rusk ruso russ rusu s-os sbbs sbor sbrk sbus sggg sggs sgro sgss skog skor skss skur sobo sobr sobs sobu sogo sogs sokk soko soku soog sook soor soos sorb sorg soro sorr sors soru soso soss souk sour sous srgb sros srub ssbr ssgs ssrg ssrs sssb ssss sub- subb subg subo subs sug- sugg sugo suks suku suor suos sur- surg suro surr surs suru sus- susk suso suss susu suus ubbo ubos uggo uggs ugos ugro ugur uguu ukko ukok uksg ukur uor- urbs urgu uro- urok uroo urso urss ursu uruk urur urus us-k usbr usbs usgo usog usos ussb ussr usss ussu usus uuuu