a-a a-b a-c a-t aaa aab aac aao aar aat aau ab- aba abb abc abo abr abt abu ac- aca acb acc aco acr act acu aoa aob aoc aoo aor aot aou ar- ara arb arc aro arr art aru at- ata atb atc ato atr att atu au- aua aub auc auo aur aut b-u baa bab bac bao bar bat bau bba bbb bbc bbo bbr bbt bbu bca bcb bcc bco bcr bct bcu boa bob boc boo bor bot bou bra brb bro brr brt bru bta btb btc bto btr btt btu bua bub buc buo bur but buu c-- caa cab cac cao car cat cau cba cbb cbc cbo cbr cbt cbu cca ccb ccc cco ccr cct ccu co- coa cob coc coo cor cot cou cra crb crc cro crr crt cru cta ctb ctc cto ctr ctt ctu cua cub cuc cuo cur cut cuu oaa oab oac oao oar oat oau ob- oba obb obc obo obr obt obu oc- oca ocb occ oco ocr oct ocu oo- ooa oob ooc ooo oor oot or- ora orb orc oro orr ort oru ot- ota otb otc oto otr ott otu ou- oua ouc ouo our out ra- raa rab rac rao rar rat rau rba rbb rbc rbo rbr rbt rbu rca rcb rcc rco rcr rct rcu roa rob roc roo ror rot rou rra rrb rrc rrr rrt rru rta rtb rtc rto rtr rtt rtu rua rub ruc ruo rur rut ruu taa tab tac tao tar tat tau tba tbb tbc tbo tbr tbt tbu tca tcb tcc tco tcr tct tcu to- toa tob toc too tor tot tou tra trb trc tro trr trt tru tta ttb ttc tto ttr ttt ttu tua tub tuc tuo tur tut tuu ua- uaa uab uac uao uar uat uau uba ubb ubc ubo ubr ubt ubu uca ucb ucc uco ucr uct ucu uoa uob uoc uoo uor uot ur- ura urb urc uro urr urt uru uta utb utc uto utr utt utu uua uuc uur uut uuu

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