aaaa aaab aaac aaar aaba aabb aabc aabt aaca aacb aacc aaco aacr aact aaoo aara aarc aaro aart aata aatc aatt abaa abab abac abar abat abb- abba abbb abbo abbr abbt abca abcb abcc abcr abct aboa abob aboo abor abot abra abrc abro abta ac-t acaa acab acac acar acat acba acca accc acco acct acoa acor acot acr- acra acrc acro acrr acta actc acto actt aoba aoca aora aorb aort aotc arab arac arar arat arba arc- arca arco arct aroa arob aroo aror arr- arra arrc arro arrr arrt arta artc arto artr at-t ataa atab atac atar atat atca atcc atco atcr atob atoc ator atot atra atrc atro atta atto attr baaa baar baat baba babb babo babr bac- baca bacc baco bact bar- bara barb barc baro barr bart bata batc bato batt bbbb bbrc bcaa bcar bcat bcbc bcca bccc bcor bcra bctc boab boac boar boat boba bobb bobo boca boco boob booc boor boot bor- bora boro borr bort bota botb boto bott brab brac brao brat brca brcb broa brob broc broo bror brot brrr brtc btaa btcc btob btor btrc btrt bttb c-bo caaa caab caac caat caba cabo cac- caca cacc caco cacr caor cara carb carc caro carr cart cat- cata catb catc cato catt cbac cbar cbat cbbc cbca cbcc cbcr cbct cbot cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc ccob ccoc ccra ccrc ccrt cctb cctc cctt coat coba cobb cobo coca coco coct coob coot cor- cora corb corc coro corr cort cota cotb cotc coto cott crab crac crar crat crbc crca crcc crcr crob croc croo cror crot crrt crtc ctab ctba ctca ctor ctot ctrc ctta oara obba obbo obor obot obra obro ocab ocac ocat ocbc occa occc occt ocra ocro ocrr oct- octa octo ooaa ooba oocr oooo oora oort ootb orab orac orao orar orat orba orbb orbo orca orco oro- oror orot orra orro orta ortc orto otac otar oto- otoo otor otra otro otta otto raab raat raba rabb rabo rac- raca racc raco ract raob raoc rara rarb raro rata rato ratt rbbb rbbr rcac rcbc rcbo rccb rccc rctc roab roar roat rob- roba robb robo robt roca rocc roco roob roor root rora rorc roro rort rota rotc roto rotr rott rrat rrrr rtca rtcc taa- taar taat taba tabb tabc tabo taca tacc taco tact taoa taor tara tarb tarc taro tarr tart tata tatb tato tatr tatt tbar tbca tbcb tbcc tbrb tbta tcca tccc tctc toab toat toba tobo tobt toca toco tooa toor toot tora torc toro torr tort tota totc toto totr tott traa trab trac trao trat trca trcc troa troc troo trot trra trtc trtr ttab ttbb tttt