-vac aaaa aaab aaac aaar aaav aaba aabb aabc aabt aaca aacb aacc aacr aact aacv aara aarc aart aata aatc aatt aava abaa abab abac abar abat abb- abba abbb abbr abbt abca abcb abcc abcr abct abra abrc abta abva ac-t acaa acab acac acar acat acba acca accc acct acr- acra acrc acrr acrv acta actc actt actv acvv arab arac arar arat arba arc- arca arct arr- arra arrc arrr arrt arta artc artr artv arva at-t ataa atab atac atar atat atca atcc atcr atra atrc atta attr avab avar avat avcc avra avva baaa baar baat baba babb babr bac- baca bacc bact bar- bara barb barc barr bart bata batc batt bava bbbb bbrc bcaa bcar bcat bcbc bcca bccc bcra bctc brab brac brat brav brca brcb brrr brtc btaa btcc btrc btrt bttb caaa caab caac caat caba cac- caca cacc cacr cara carb carc carr cart cat- cata catb catc catt catv cava cbac cbar cbat cbbc cbca cbcc cbcr cbct cbrt cbta cbtc cbtv cbva cbvb cbvr ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccv ccra ccrc ccrt cctb cctc cctt cctv crab crac crar crat crbc crca crcc crcr crrt crtc crtv ctab ctba ctca ctrc ctta ctvt cvac cvar cvca cvcc cvra cvrr raab raat raba rabb rac- raca racc ract racv rara rarb rata ratt rava rbbb rbbr rcac rcbc rccb rccc rctc rctv rcvr rrat rrrr rtca rtcc rtva rv-c rvca taa- taar taat taba tabb tabc taca tacc tact tacv tara tarb tarc tarr tart tata tatb tatr tatt tatv tava tbar tbca tbcb tbcc tbrb tbta tcca tccc tctc traa trab trac trat trav trca trcc trra trtc trtr ttab ttbb tttt tvac tvrr tvtv vaar vaat vaca vara varr vart vata vatt vava vbcc vcat vrac vrav vrba vtac vvvv