-vac aaaa aaab aaac aaar aaav aaba aabb aabc aabt aaca aacb aacc aaco aacr aact aacv aaoo aara aarc aaro aart aata aatc aatt aava abaa abab abac abar abat abb- abba abbb abbo abbr abbt abca abcb abcc abcr abct aboa abob aboo abor abot abov abra abrc abro abta abva ac-t acaa acab acac acar acat acba acca accc acco acct acoa acor acot acr- acra acrc acro acrr acrv acta actc acto actt actv acvv 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 artv arva arvo at-t ataa atab atac atar atat atca atcc atco atcr atob atoc ator atot atra atrc atro atta atto attr avab avao avar avat avcc avco avor avot avra avro avva avvo baaa baar baat baba babb babo babr bac- baca bacc baco bact bar- bara barb barc baro barr bart bata batc bato batt bava bbbb bbrc bcaa bcar bcat bcbc bcca bccc bcor bcra bctc bcvo boab boac boar boat boba bobb bobo boca boco boob booc boor boot bor- bora boro borr bort bota botb boto bott bova bovo brab brac brao brat brav 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 catv cava cavo cbac cbar cbat cbbc cbca cbcc cbcr cbct cbot cbrt cbta cbtc cbtv cbva cbvb cbvr ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccv ccob ccoc ccra ccrc ccrt cctb cctc cctt cctv ccvo coat coba cobb cobo coca coco coct coob coot cor- cora corb corc coro corr cort cota cotb cotc coto cott cova covo crab crac crar crat crbc crca crcc crcr crob croc croo cror crot crrt crtc crtv ctab ctba ctca ctor ctot ctrc ctta ctvo ctvt cvac cvar cvca cvcc cvra cvrr 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 orav orba orbb orbo orca orco oro- oror orot orra orro orta ortc orto orvr otac otar oto- otoo otor otov otra otro otta otto ovar ovo- ovoo ovot ovra raab raat raba rabb rabo rac- raca racc raco ract racv raob raoc rara rarb raro rata rato ratt rava rbbb rbbr rcac rcbc rcbo rccb rccc rctc rctv rcvr roab roar roat rob- roba robb robo robt roca rocc roco roob roor root rora rorc roro rort rota rotc roto rotr rott rova rovo rrat rrrr rtca rtcc rtva rv-c rvca taa- taar taat taba tabb tabc tabo taca tacc taco tact tacv taoa taor tara tarb tarc taro tarr tart tata tatb tato tatr tatt tatv tava tavo tbar tbca tbcb tbcc tbrb tbta tcca tccc tcov tctc toab toat toba tobo tobt toca toco tooa toor toot tora torc toro torr tort torv tota totc toto totr tott tova tovo traa trab trac trao trat trav trca trcc troa troc troo trot trra trtc trtr ttab ttbb tttt tvac tvro tvrr tvtv vaar vaat vaca vaco vara varr vart vata vato vatt vava vbcc vcat voar voat voca vooc voor voot vor- vora voro vort vota voto vrac vrav vrba vroc vrot vrto vtac vvob vvvv