-ous bbbb bbbs bbrc bcbc bcbs bccc bccs bcor bcos bcrs bcru bcsc bcss bctc bcts bcuc bobb bobo bobs bobu boco bocs bocu boob booc boor boos boot bor- boro borr bors bort boru bosc boso boss bost bosu botb boto bots bott bour bous bout brcb brob broc broo bror bros brot brou brrr brrs brsb brsr brst brtc bruc brus brut bscs bsos bssc bsts btcc btcs btob btor btrc btrt btss bttb btus bubb bubo bubs bubu bucc buco bucs bucu bur- burb buro burr burs burt buru busc buss bust busu but- buto buts butt buus c-bo cbbc cbbs cbcc cbcr cbcs cbct cbcu cbot cbrt cbsc cbtc cbus ccbc cccb cccc cccs cccu ccob ccoc ccrc ccrs ccrt ccss ccst cctb cctc cctt ccuc ccus ccut cobb cobo cobs cobu coco coct cocu coob coos coot cor- corb corc coro corr cors cort cosc coso coss cost cotb cotc coto cots cott cotu coub cour cous cout crbc crbu crcc crcr crob croc croo cror crot crrt crss crst crtc crts crub crus crut cscb cscc csco cscr cscs csob csor csos csot csrc csrs cssr cstc csto cstr csts csur csus ctbs ctor ctos ctot ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubs cucc curb curo curr curs curt cusb cuso cuss cust cusu cut- cutc cuto cuts cutt obbo obor obos obot obro obsr obss obst obts obus ocbc occc occt ocos ocro ocrr ocrs oct- octo octs ocur oocr oooo ooos oort oost ootb oots oous orbb orbo orbs orbu orco orcs oro- oror oros orot orro orrs orso orsu ortc orto orts orub orus oscc osco osoo osor osos osro ossb osso ossu ostc ostr osts otbs oto- otoo otor otos otro otrs otso otsu otto otts ottu otur otus oubs oucc our- ouro ours ourt oust out- outb outo outs ouu- rbbb rbbr rbbs rbss rbst rcbc rcbo rccb rccc rccs rcos rcsc rcss rctc rcts rob- robb robo robs robt robu rocc roco rocs roob roor roos root rorc roro rort roru rosc roso ross rost rotc roto rotr rots rott roub rous rout rrrr rscc rscs rsos rsts rstu rtcc rtss rtts rubb rubs rubu ruct rurc ruro rurs ruru ruso russ rust rusu ruto ruts rutt rutu s-os sbbs sbcc sbcs sbct sbor sbot sbst sbtc sbus sccc sccs scct scob scoo scor scot scr- scrc scrs scsc scso scsr scst scsu sctc scto sctr scts scub scur scut sobo sobr sobs sobt sobu soco socr socs soor soos soot sorb soro sorr sors sort soru soso soss sost sotc soto sots sotu sour sous sout srbc srcc srct sros srtr srub ssbr sscc sscs ssoc ssot ssrc ssrs sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stcu stob stoo stor stos stot stou strc stro strs stru stss sttc sttr stub stuc stur stus stut sub- subb subo subs suc- succ sucr sucs suor suos sur- surc suro surr surs surt suru sus- suso suss sust susu suto sutu suus tbbs tbcb tbcc tbrb tbst tcbs tccc tccu tcos tctc tcts tobo tobs tobt tobu toco toor toos toot torc toro torr tors tort toru tosb tosc toso toss tost tosu totc toto totr tots tott tour tous tout trcc troc troo tros trot trou trst trtc trtr trub truc trus trut truu tsbc tscc tsob tsos tsou tssr tsst tstc tsts ttbb ttss tttt tubb tubo tubr tubs tubu tucc tuco tuor tuos turb turc turo turr turs turt turu tusc tuss tust tuto tuts tutt tutu tuuo ubbo uboc ubos ucbc ucos ucrc ucsb ucsc ucst ucsu ucut uocc uor- urbs uro- uroo urso urss ursu urts urur urus urut usbc usbr usbs uscc usco uscs usoc usos ussb ussc ussr usss usst ussu ustb ustc usto usts usus utor utsc utto uttu uuoc uuuu