-vac aaaa aaab aaac aaar aaav aaba aabb aabc aaca aacb aacc aacr aacv aara aarc aava abaa abab abac abar abb- abba abbb abbr abca abcb abcc abcr abra abrc abva acaa acab acac acar acba acca accc acr- acra acrc acrr acrv acvv arab arac arar arba arc- arca arr- arra arrc arrr arva avab avar avcc avra avva baaa baar baba babb babr bac- baca bacc bar- bara barb barc barr bava bbbb bbrc bcaa bcar bcbc bcca bccc bcra brab brac brav brca brcb brrr caaa caab caac caba cac- caca cacc cacr cara carb carc carr cava cbac cbar cbbc cbca cbcc cbcr cbva cbvb cbvr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccv ccra ccrc crab crac crar crbc crca crcc crcr cvac cvar cvca cvcc cvra cvrr raab raba rabb rac- raca racc racv rara rarb rava rbbb rbbr rcac rcbc rccb rccc rcvr rrrr rv-c rvca vaar vaca vara varr vava vbcc vrac vrav vrba vvvv