-ous bbbb bbbs bobb bobo bobs bobu boko boks boku boob book boor boos booz bor- bork boro borr bors boru borz bosk boso boss bosu bouk bour bous bozo brkb brob brok broo bror bros brou broz brrr brrs brsb brsr brus bruz bsos bubb bubo bubs bubu bukk buko buku bur- burb burk buro burr burs buru burz busk buss busu buus buuz buzz bzou bzrk bzzz k-os kbbb kbbk kbbo kbbr kbbs kbbu kbbz kbkb kbkk kbko kbkr kbkz kbob kbok kboo kbos kboz kbrb kbrk kbro kbru kbrz kbsb kbsk kbso kbsr kbss kbsu kbsz kbub kbuk kbur kbus kbuu kbuz kbzo kbzs kbzu kbzz kkbb kkbo kkbr kkbs kkbz kkkk kkob kkoo kkor kkoz kkrb kkrk kkro kkrr kkrs kkrz kksr kkss kksu kkus kkuu kkzu kkzz kobb kobk kobo kobr kobs kobu kokb kokk koko kokr koks koku kokz koob kook kooo koor koos koou kooz korb kork koro korr kors koru kos- kosb koso kosr koss kosu kosz koub kour kous kouu kozb kozk kozo kozr kozu krbb krbk krbr krbz krkk krko krkr krks krku krkz krob krok kroo kror kros kroz krrb krrk krro krrr krrs krrz krsk krsr krss krsu kruk krur kruz krzk krzr krzs krzz ksbr ksbs ksbz kskb kskk ksko kskr ksks ksku kskz ksob ksok ksoo ksor ksos ksou ksrb ksro ksrr ksrs ksrz ksso kssr ksss kssu kssz ksub ksuu kszr kubb kubo kubr kubs kubu kukk kuks kuku kuok kuoo kuos kurb kurk kuro kurr kurs kuru kurz kusb kuso kusu kuub kuuk kuur kuuu kuuz kuzu kuzz kzbb kzbk kzbr kzbs kzbz kzkr kzks kzkz kzoo kzor kzoz kzrb kzrk kzro kzrr kzrs kzrz kzsb kzsu kzus kzuu kzuz kzzb kzzk kzzo kzzr kzzs kzzz 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 oroz orro orrs orsk orso orsu orub orus orzk orzo orzu osku osoo osor osos osro ossb osso ossu oubs our- ouro ours ouu- ouzo rbbb rbbr rbbs rbss rkos rkss rob- robb robo robs robu rokk roko rokr roks roku roob rook roor roos rooz rork roro roru roso ross roub rouk rous rouz rozz rrrr rsos rubb rubs rubu rukk ruku ruok ruro rurs ruru rusk ruso russ rusu s-os sbbs sbor sbrk sbus skor skss skur sobo sobr sobs sobu sokk soko soku sook soor soos sorb soro sorr sors soru soso soss souk sour sous soz- sros srub srzu ssbr ssrs sssb ssss sub- subb subo subs subz suks suku suor suos sur- suro surr surs suru sus- susk suso suss susu susz suus suzo suzu suzz szob szss szur ubbo ubos ukko ukok ukur uor- urbs uro- urok uroo urso urss ursu uruk urur urus uruz us-k usbr usbs usos ussb ussr usss ussu usus uuuu uzos z-ro zbus zobo zoku zoo- zook zoos zorb zork zoro zors zoso zoss zouk zozo zozu zsss zubo zubr zubu zuko zukr zuoz zurb zurr zuru zuuk zuzu zzzs zzzz