-ana aaaa aaab aaac aaad aaan aaba aabb aabc aabd aaca aacb aacc aacd aacn aada aadc aana aand abaa abab abac abad aban abb- abba abbb abca abcb abcc abcd abcn abda acaa acab acac acad acan acba acca accc accd acda acdb acdc adaa adab adac adad adan adba adbc adcc adda addc addd addn adna ana- anaa anab anac anad anan anba anbb anca ancc and- anda anna annb baaa baad baan baba babb bac- baca bacc bacn bada badb badd bana banc band bann bbad bbbb bbdd bcaa bcbc bcca bccc bcda bdbc bddc bdna c-cd caaa caab caac caan caba cac- caca cacc cada cadc cadd cana canc cand cann cbac cbbc cbca cbcc cbcn cbdb cbdc cbdn cbna cbnd ccaa ccab ccac ccad ccba ccbc ccbn ccca cccb cccc ccdc ccdn ccna ccnb ccnc cdaa cdac cdad cdba cdda cddb cdna cdnb cdnc cnaa cnac cnbc cnda cndd cnna d-na daab daad daan daba dabb daca dada dana dand dann dbcc dcbc dcca dccb dccc dcdb dddd dnaa dnab dnac dnad dnan naaa naab naac naad naan naba nabc naca nacc nacd nada nadc nan- nana nanb nand nann nbaa nbad nbbc nbca nbcc ncaa ncac ncba ncbc ncca nccc nccn ncda ncdc ncdn ncna ncnc ncnd ndaa ndcc nddb ndna nndb nnnn