-ous bbbb bbbs bnor bnrr bnss bobb bobo bobs bobu bonn bono bons bonu boob boon boor boos bor- born boro borr bors boru bosn boso boss bosu boun bour bous brno brns brob bron broo bror bros brou brrr brrs brsb brsr brun brus bsns bson bsos bubb bubo bubs bubu bunb bunn buno buns bunu buon bur- burb burn buro burr burs buru buss busu buus nbbo nnnn nnos nnss nobo nobs nobu non- nonn nono nons nonu noo- noob noon nooo noor noos nor- norb norn noro norr nors nos- noss nosu noun nour nous nron nsbo nsnr nsos nsou nssb nsso nssr nsss nsub nubs nunn nuno nuns nuon nurn nurr nurs nuru nuss nusu obbo obon obor obos obro obsn obsr obss obus onno onon onor onos onso onur onus oons oooo ooos oous orbb orbo orbs orbu orno orns oro- oron oror oros orro orrs orso orsu orub orus osno osnr osoo osor osos osro ossb osso ossu osun oubs oun- our- ourn ouro ours ouu- rbbb rbbr rbbs rbss rnbr rob- robb robo robs robu rono rons roob roon roor roos roro roru roso ross roub roun rous rrrr rrun rsnn rsno rsnr rsos rubb rubs rubu runn runo runs ruro rurs ruru ruso russ rusu ruun s-os sbbs sbor sbus snns snob snoo snor snos snrs snub snur snus sobo sobr sobs sobu son- sono sons sonu soon soor soos sorb sorn soro sorr sors soru soso soss soun sour sous srnn srno sros srub ssbn ssbr ssns ssrs sssb ssss sub- subb subo subs sun- sunb sunn suno suns sunu suor suos sur- surn suro surr surs suru sus- suso suss susu suus ubbo ubon ubos unno unns unon unos unro unrs uns- unso unus uor- urbs urns uro- uroo urso urss ursu urun urur urus usbr usbs usno usnr usnu usos ussb ussr usss ussu usun usus uuno uuuu