-vac aaaa aaac aaar aaav aaca aacc aaco aacr aact aacv aaoo aara aarc aaro aart aata aatc aatt aava ac-t acaa acac acar acat acca accc acco acct acoa acor acot acr- acra acrc acro acrr acrv acta actc acto actt actv acvv aoca aora aort aotc arac arar arat arc- arca arco arct aroa aroo aror arr- arra arrc arro arrr arrt arta artc arto artr artv arva arvo at-t ataa atac atar atat atca atcc atco atcr atoc ator atot atra atrc atro atta atto attr avao avar avat avcc avco avor avot avra avro avva avvo caaa caac caat cac- caca cacc caco cacr caor cara carc caro carr cart cat- cata catc cato catt catv cava cavo ccaa ccac ccar ccat ccca cccc cccv ccoc ccra ccrc ccrt cctc cctt cctv ccvo coat coca coco coct coot cor- cora corc coro corr cort cota cotc coto cott cova covo crac crar crat crca crcc crcr croc croo cror crot crrt crtc crtv ctca ctor ctot ctrc ctta ctvo ctvt cvac cvar cvca cvcc cvra cvrr oara ocac ocat occa occc occt ocra ocro ocrr oct- octa octo ooaa oocr oooo oora oort orac orao orar orat orav 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 raat rac- raca racc raco ract racv raoc rara raro rata rato ratt rava rcac rccc rctc rctv rcvr roar roat roca rocc roco roor root rora rorc roro rort rota rotc roto rotr rott rova rovo rrat rrrr rtca rtcc rtva rv-c rvca taa- taar taat taca tacc taco tact tacv taoa taor tara tarc taro tarr tart tata tato tatr tatt tatv tava tavo tcca tccc tcov tctc toat toca toco tooa toor toot tora torc toro torr tort torv tota totc toto totr tott tova tovo traa trac trao trat trav trca trcc troa troc troo trot trra trtc trtr tttt tvac tvro tvrr tvtv vaar vaat vaca vaco vara varr vart vata vato vatt vava vcat voar voat voca vooc voor voot vor- vora voro vort vota voto vrac vrav vroc vrot vrto vtac vvvv