bbbb bbci bbrc bcbc bccc bcci bcit bcor bcru bctc bcuc bibb bibi bibo bicc bici bico bio- bioc bioi biot biou birb biri biro birr birt biru bitc bito bitt bitu bobb bobi bobo bobu boco bocu boi- boii boit boiu boob booc boor boot bor- bori boro borr bort boru botb boti boto bott bour bout brcb bric brio brit brob broc broo bror brot brou brrr brtc bruc brut btcc btob btor btrc btrt bttb bubb bubi bubo bubu bucc buci buco bucu buic buir buit buiu bur- burb buri buro burr burt buru but- buti buto butt c-bo cbbc cbcc cbcr cbct cbcu cbir cbit cbot cbrt cbtc ccbc cccb cccc ccci cccu ccic ccii ccir ccob ccoc ccrc ccri ccrt cctb cctc cctt ccuc ccut cibc cibi cibo cicc cici cico cicr cict cicu ciii ciit ciob cior cirb circ ciri ciro cirr cirt citb citi cito citt citu ciuc cobb cobi cobo cobu coco coct cocu coir coit coob coot cor- corb corc cori coro corr cort cotb cotc coti coto cott cotu coub cour cout crbc crbu crcc crcr crib cric crit criu crob croc croo cror crot crrt crtc crub crut ctbi ctic ctor ctot ctrc cub- cubb cubi cucc cuci cui- cuir cuit curb curi curo curr curt cut- cutc cuto cutt ibot ibrc ibri ibro ibtb ibtc icbc iccb iccc icci icco iccr icct iccu icoc icor icrc icrr icrt icru icub iiii iiio iiit iioi iioo iirc iitr iitt iiuc iobi ioci ioii ioio ioit iooi iooo iori ioto ircc ircu iri- iric irio irob iroc irrc irri irti itic itoi itoo itor itou itri itto itur iucc iuiu obbo obit oboi obor obot obri obro ocbc occc occi occt ocro ocrr oct- octi octo ocur oici oiii oirt oitc oiti oobi oocr oooo oort ootb orbb orbi orbo orbu orci orco ori- oric orio orit oro- oror orot orri orro ortc orto orub otic otit oto- otoo otor otro otti otto ottu otur oucc ouii ouir ouit our- ouro ourt out- outb outi outo ouu- rbbb rbbr rcbc rcbo rccb rccc rcic rctc rcti rib- ribo ribu ricc rico rict riot riou riri riti rito ritt ritu rob- robb robi robo robt robu rocc roco roio roir roit roiu roob rooi roor root rorc rori roro rort roru rotc roti roto rotr rott roub rout rrrr rtcc rubb rubi rubu ruci ruct ruit rurc ruri ruro ruru ruti ruto rutt rutu tbcb tbcc tbit tbrb tccc tccu tctc tibi tibu ticc tico tiit tiiu tiou tirb tiri tiro tirr tiru titc titi tito titt titu tobi tobo tobt tobu toci toco toit toor toot torc tori toro torr tort toru totc toti toto totr tott toui tour tout trcc tri- trib tric trio trit troc troi troo trot trou trtc trtr trub truc trut truu ttbb tttt tubb tubo tubr tubu tucc tuco tuit tuiu tuor turb turc turi turo turr turt turu tuti tuto tutt tutu tuuo ubbi ubbo ubic ubii ubir ubit uboc ucbc ucci ucio ucrc ucut uirr uocc uor- urbi urci urib uric uriu uro- uroo urri urur urut utor utri utti utto uttu uuoc uuri uuuu