-ana aaaa aaab aaac aaan aaar aaba aabb aabc aaca aacb aacc aacn aacr aana aara aarc abaa abab abac aban abar abb- abba abbb abbr abca abcb abcc abcn abcr abra abrc acaa acab acac acan acar acba acca accc acr- acra acrc acrr ana- anaa anab anac anan anar anba anbb anca ancc anna annb anrc arab arac aran arar arba arc- arca arna arr- arra arrc arrr baaa baan baar baba babb babr bac- baca bacc bacn bana banc bann banr bar- bara barb barc barn barr bbbb bbrc bcaa bcar bcbc bcca bccc bcra bnrr brab brac bran brca brcb brna brrr caaa caab caac caan caba cac- caca cacc cacr cana canc cann cara carb carc carn carr cbac cbar cbbc cbca cbcc cbcn cbcr cbna cbrn ccaa ccab ccac ccar ccba ccbc ccbn ccca cccb cccc ccna ccnb ccnc ccnr ccra ccrc cnaa cnac cnbc cnna cnrc cnrr crab crac cran crar crbc crca crcc crcr crna naaa naab naac naan naar naba nabc naca nacc nan- nana nanb nann nara narc narn narr nbaa nbar nbbc nbca nbcc ncaa ncac ncar ncba ncbc ncca nccc nccn nccr ncna ncnc ncra ncrc nnnn nrab nrca nrna nrrc raab raan raba rabb rac- raca racc rana ranc rann rara rarb rbbb rbbr rcac rcbc rccb rccc rcnr rnbr rrna rrrr