bbbb bbrc bcbc bccc bcnu bcor bcru bctc bcuc bnoc bnor bnrr bobb bobo bobu boco bocu bonc bonn bono bont bonu boob booc boon boor boot bor- born boro borr bort boru botb botn boto bott boun bour bout brcb brno brob broc bron broo bror brot brou brrr brtc bruc brun brut btcc btob btor btrc btrt bttb bubb bubo bubu bucc buco bucu bunb bunn buno bunt bunu buon bur- burb burn buro burr burt buru but- buto butt c-bo cbbc cbcc cbcn cbcr cbct cbcu cbot cbrn cbrt cbtc ccbc ccbn cccb cccc cccu ccnb ccnc ccnr ccnu ccob ccoc ccrc ccrt cctb cctc cctt ccuc ccut cnbc cnco cnrc cnrr cnrt cntc cntr cnut cobb cobo cobu coco coct cocu con- conc conn cono cont coob coon coot cor- corb corc corn coro corr cort cotb cotc cotn coto cott cotu coub coun cour cout crbc crbu crcc crcr crob croc cron croo cror crot crrt crtc crub crun crut ctor ctot ctrc ctrn cttn cub- cubb cucc cucn cuno cunt cuon curb curn curo curr curt cut- cutc cuto cutt nbbc nbbo nbcc nbco ncbc nccc nccn nccr ncct nccu ncnc ncoc ncor ncrc nctc nctr nnnn nnot nntn nobc nobo nobu noco noct non- nonn nono nont nonu noo- noob noon nooo noor noot nor- norb norc norn noro norr nort not- noto nott noun nour nout nroc nron nrrc ntbc ntcc ntnu ntrc ntru ntto nttr ntuc nubc nucu nunc nunn nuno nunt nuoc nuon nurc nurn nurr nurt nuru nutt nutu obbo obon obor obot obro ocbc occc occn occt ocon ocro ocrr oct- octo ocur onc- onco onct onno onon onor ont- ontc onto onur onut oocr oont oooo oort ootb orbb orbo orbu orco ornc orno oro- oron oror orot orro ortc orto orub oto- oton otoo otor otro otto ottu otur oucc oun- our- ourn ouro ourt out- outb outo ouu- rbbb rbbr rcbc rcbo rccb rccc rcnr rcon rctc rnbr rnco rnnt rnot rnut rob- robb robo robt robu rocc roco ronc rono ront roob roon roor root rorc roro rort roru rotc rotn roto rotr rott roub roun rout rrrr rrun rtcc rubb rubu ruct runc runn runo runt rurc ruro ruru ruto rutt rutu ruun tbcb tbcc tbrb tccc tccu tcnn tcon tctc tnbc tncc tnut tobo tobt tobu toco tonb tonn tono tonu toon toor toot torc torn toro torr tort toru totc toto totr tott toun tour tout trcc trno troc tron troo trot trou trtc trtr trub truc trun trut truu ttbb ttcn tton tttt tubb tubo tubr tubu tucc tuco tunb tunc tunn tuno tunu tuor turb turc turn turo turr turt turu tuto tutt tutu tuuo ubbo uboc ubon ucbc ucon ucrc ucut uncc unco unct unno unon unro untb unto unut uocc uor- uro- uroo urun urur urut utor utto uttu uuno uuoc uuuu