aaaa aaab aaac aaar aaba aabb aabc aabt aaca aacb aacc aaco aacr aact aacu aaoo aara aarc aaro aart aaru aata aatc aatt abaa abab abac abar abat abau abb- abba abbb abbo abbr abbt abca abcb abcc abcr abct aboa abob aboo abor abot abou abra abrc abro abta abtu abua abut ac-t acaa acab acac acar acat acba acca accc acco acct accu acoa acor acot acou acr- acra acrc acro acrr acta actc acto actt actu acu- acuo acur acut aoba aoca aora aorb aort aotc aout arab arac arar arat arau arba arc- arca arco arct aroa arob aroo aror arr- arra arrc arro arrr arrt arru arta artc arto artr arua arub arut at-t ataa atab atac atar atat atca atcc atco atcr atob atoc ator atot atra atrc atro atru atta atto attr attu atua atub atuc atur auaa auca auct aur- aura auro aut- auto baaa baar baat baba babb babo babr babu bac- baca bacc baco bact bar- bara barb barc baro barr bart baru bata batc bato batt batu bau- baur bbau bbbb bbrc bcaa bcar bcat bcbc bcca bccc bcor bcra bcru bctc bcuc boab boac boar boat boba bobb bobo bobu boca boco bocu boob booc boor boot bor- bora boro borr bort boru bota botb boto bott boua bour bout brab brac brao brat brau brca brcb broa brob broc broo bror brot brou brrr brtc bruc brut btaa btcc btob btor btrc btrt bttb buar buat buba bubb bubo bubu buca bucc buco bucu bur- bura burb buro burr burt buru but- buta buto butt c-bo caaa caab caac caat caba cabo cabu cac- caca cacc caco cacr caor cara carb carc caro carr cart cat- cata catb catc cato catt catu cauc cauo caut cbac cbar cbat cbbc cbca cbcc cbcr cbct cbcu cbot cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccu ccob ccoc ccra ccrc ccrt cctb cctc cctt ccuc ccut coat coba cobb cobo cobu coca coco coct cocu coob coot cor- cora corb corc coro corr cort cota cotb cotc coto cott cotu coua coub cour cout crab crac crar crat crau crbc crbu crca crcc crcr crob croc croo cror crot crrt crtc crub crut ctab ctba ctca ctor ctot ctrc ctta cuau cub- cuba cubb cuca cucc cura curb curo curr curt cut- cuta cutc cuto cutt oaau oara obba obbo obor obot obra obro ocab ocac ocat ocbc occa occc occt ocra ocro ocrr oct- octa octo ocur ooaa ooba oocr oooo oora oort ootb orab orac orao orar orat orba orbb orbo orbu orca orco oro- oror orot orra orro orta ortc orto orub otac otar oto- otoo otor otra otro otta otto ottu otur ouac ouat oucc our- oura ouro ourt out- outa outb outo ouu- raab raat raba rabb rabo rabu rac- raca racc raco ract racu raob raoc rara rarb raro rata rato ratt ratu raua raub rauc raut rbbb rbbr rcac rcbc rcbo rccb rccc rctc roab roar roat rob- roba robb robo robt robu roca rocc roco roob roor root rora rorc roro rort roru rota rotc roto rotr rott roua roub rout rrat rrrr rtca rtcc ruba rubb rubu ruca ruct rura rurc ruro ruru ruta ruto rutt rutu taa- taar taat taba tabb tabc tabo tabu taca tacc taco tact taoa taor taou tara tarb tarc taro tarr tart taru tata tatb tato tatr tatt tatu taua taub tauc taur taut tbar tbca tbcb tbcc tbrb tbta tcca tccc tccu tctc toab toat toau toba tobo tobt tobu toca toco tooa toor toot tora torc toro torr tort toru tota totc toto totr tott tour tout traa trab trac trao trat trau trca trcc troa troc troo trot trou trra trtc trtr trub truc trut truu ttab ttbb tttt tuao tuar tuat tuba tubb tubo tubr tubu tuca tucc tuco tuor tura turb turc turo turr turt turu tuta tuto tutt tutu tuuo uabc uaca uaoc uarc uart uaru uata uatu uaua ubac ubar ubba ubbo uboc ubra ucar ucat ucbc ucca ucrc ucua ucut uocc uor- urac urao urat urau urba urca uro- uroa uroo urra urur urut utac utau utor utto uttu uuoc uuta uuuu