-ous bbbb bbbs bksp bobb bobo bobs bobu boko boks boku boob book boop boos bopp bops bosk boso boss bosu bouk boup bous bpsu bsos bspp bsup bubb bubo bubs bubu bukk buko buku bups busk buss busu buus k-os kbbb kbbk kbbo kbbs kbbu kbkb kbkk kbko kbob kbok kboo kbos kbpk kbpo kbps kbpu kbsb kbsk kbso kbss kbsu kbub kbuk kbup kbus kbuu kkbb kkbo kkbs kkkk kkob kkoo kkpk kkps kksp kkss kksu kkup kkus kkuu kobb kobk kobo kobs kobu kokb kokk koko kokp koks koku koob kook kooo koop koos koou kopb kopp kops kopu kos- kosb koso kosp koss kosu koub kous kouu kpbb kpbs kpkk kpob kpok kpoo kpop kpou kppk kppo kppp kpso kpsp kpsu kpub kpus ksbp ksbs kskb kskk ksko ksks ksku ksob ksok ksoo ksop ksos ksou kspb kspk kspo ksps ksso ksss kssu ksub ksup ksuu kubb kubo kubs kubu kukk kuks kuku kuok kuoo kuop kuos kupb kups kupu kusb kuso kusp kusu kuub kuuk kuuu obbo obkb obok obos obss obus okko okok okpo okso okus ooku oooo ooos oops oous opo- opos oppo opps opsu opus osbp osku osoo osos ossb osso ossu oubs ouu- pbpk pbsp pobo pobs poko poku pook poop poos pop- popo popp pops posb posk poso poss pouk poup pous ppos pppo pppp ppps ppss psos psou pspp psps psso pubs pubu puku pups pupu pusk puss s-os sbbs sbsp sbus skop skpo skss skup sobo sobp sobs sobu sokk soko soku sook soop soos sopo sopp sops sopu soso soss souk soup sous spok spoo spop spos spps spso spsp spss spus ssop sspo ssps sssb ssss sub- subb subo subs suks suku suos sup- supo supp sups sus- susk suso susp suss susu suus ubbo ubos ukko ukok ukps ukup upos uppp uppu upup us-k usbs usos uspo uspp usps ussb usss ussu usus uuuu