-ana aaaa aaab aaac aaal aaan aaba aabb aabc aabl aaca aacb aacc aacl aacn aala aalc aall aana abaa abab abac abal aban abb- abba abbb abca abcb abcc abcl abcn abla acaa acab acac acan acba acbl acca accc acla aclc alaa alac alal alan alb- alba albc alca alcc all- alla alll alln alna ana- anaa anab anac anal anan anba anbb anbl anca ancc anla anlc anln anna annb baaa baal baan baba babb bac- baca bacc bacn bala balc ball bana banc bann bbbb bblb bcaa bcbc bcca bccc bccl blaa blab blac blan caaa caab caac caal caan caba cac- caca cacc cala calc call cana canc cann cbac cbal cbbc cbca cbcc cbcl cbcn cblb cblc cbln cbna ccaa ccab ccac ccba ccbc ccbn ccca cccb cccc cccl ccla cclc ccna ccnb ccnc clab clan cnaa cnac cnbc cnbl cnna laaa laac laal laan laba laca lacc lacl lala lall lan- lana lanc lann lbcc lcac lcbc lcca lccc llan llcc lllc llll naaa naab naac naal naan naba nabc nabl naca nacc nacl nala nalc nall nan- nana nanb nann nbaa nbbc nbca nbcc ncaa ncac ncba ncbc ncca nccc nccn nclc ncln ncna ncnc nlab nlcc nnnn