-ous bbbb bbbs bbfn bffs bfsr bnor bnrr bnss bobb bobo bobs bobu boff bofs bofu bonn bono bons bonu boob boof boon boor boos bor- borf born boro borr bors boru bosn boso boss bosu bouf boun bour bous brfu brno brns brob bron broo bror bros brou brrr brrs brsb brsr brun brus bsff bsfs bsns bson bsos bubb bubo bubs bubu buff bufo bufr bunb bunn buno buns bunu buon bur- burb burn buro burr burs buru buss busu buus fbrs fbus ffff ffrr ffss ffun fnrs fnuf fobs fofo fono fons foof foon foos for- forb forn foro forr fors fosb foso foss foun four fous frns frob fron fros frou frsb frso frub frun fsfo fssf fubb fubs fubu fuff fufu funf funs fuor fur- furn furo furr furs fuso fuss fusu nbbo nbuf nfff nfon nfrs nfsr nfsu nnnn nnos nnss nobo nobs nobu non- nonn nono nons nonu noo- noob noon nooo noor noos nor- norb norf norn noro norr nors nos- noss nosu noun nour nous nron nsbo nsfs nsnr nsof nsos nsou nssb nssf nsso nssr nsss nsub nubs nuff nunn nuno nuns nuon nurn nurr nurs nuru nuss nusu obbo obon obor obos obro obsn obsr obss obus off- offo offr offs offu ofno ofor ofus onno onon onor onos onso onur onus ooff oofs oons oooo ooos oous orbb orbo orbs orbu orff orfs orfu orno orns oro- orof oron oror oros orro orrs orso orsu orub orus osno osnr osoo osor osos osro ossb osso ossu osun oubs ouff oun- our- ourn ouro ours ouu- rbbb rbbr rbbs rbss rnbr rob- robb robo robs robu roff rofo rono rons roob roof roon roor roos roro roru roso ross roub rouf roun rous rrrr rrun rsnn rsno rsnr rsos rubb rubs rubu ruff rufo runf runn runo runs ruro rurs ruru ruso russ rusu ruun s-os sbbs sbor sbus sfnb sfor sfos sfro sfss sfsu snfu snns snob snoo snor snos snrs snub snur snus sobo sobr sobs sobu sofo son- sono sons sonu soof soon soor soos sorb sorn soro sorr sors soru soso soss souf soun sour sous srnn srno sros srub ssbn ssbr ssns ssrs sssb sssf ssss sub- subb subo subs suf- suff sufr sufs sufu sun- sunb sunn suno suns sunu suor suos sur- surf surn suro surr surs suru sus- suso suss susu suus ubbo ubon ubos ufos unno unns unon unos unrf unro unrs uns- unso unus uofo uor- urbs urff urns uro- uroo urso urss ursu urun urur urus usbr usbs usfs usno usnr usnu usos ussb ussf ussr usss ussu usun usus uuno uuuu