-ana a-ak aaaa aaab aaac aaad aaan aaba aabb aabc aabd aaca aacb aacc aacd aack aacn aada aadc aaka aana aand abaa abab abac abad abak aban abb- abba abbb abca abcb abcc abcd abcn abda acaa acab acac acad acan acba acca accc accd acda acdb acdc ackd adaa adab adac adad adak adan adba adbc adcc adda addc addd addn adna akaa akan akca akdn akka akna ana- anaa anab anac anad anak anan anba anbb anca ancc and- anda ank- anka anna annb baaa baad baak baan baba babb bac- baca bacc back bacn bada badb badd bak- baka bana banc band bank bann bbad bbbb bbdd bcaa bcbc bcca bccc bcda bdbc bddc bdna c-cd caaa caab caac caan caba cac- caca cacc cack cada cadc cadd caka cana canc cand cank cann cbac cbbc cbca cbcc cbcn cbdb cbdc cbdn cbka cbkn 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 ckac ckan ckbc ckck cknb cknc cnaa cnac cnbc cnda cndd cnna d-na daab daad daan daba dabb daca dada daka dana dand dank dann dbcc dcbc dcca dccb dccc dcdb dddd dkba dkdc dnaa dnab dnac dnad dnan kaaa kaab kaak kaan kaba kabb kabc kabd kacb kacc kacd kad- kada kadd kaka kakc kakk kakn kana kanb kand kann kbaa kbab kbac kbad kbak kbba kbbb kbbc kbbd kbbk kbca kbcb kbck kbdb kbdn kbkb kbkk kbna kbnd kbnn kcaa kcab kcac kcad kcba kcbc kcbd kcbk kcca kccb kccc kccd kcck kcda kcdc kcdd kckc kckk kckn kcnb kcnd kdaa kdab kdac kdad kdak kdbb kdbn kdca kdcc kdcd kddb kddc kddd kddk kdka kdkb kdkd kdkk kdkn kdna kdnd kdnk kdnn kkaa kkac kkan kkba kkbb kkbd kkbn kkcb kkcd kkck kkcn kkda kkdc kkdd kkkk kknb kknd kknn knaa knab knac knan knba knbb knbc knbn knca kncb knck kncn knda kndb kndc kndd kndk kndn knkk knnb knnd knnk naaa naab naac naad naan naba nabc nabk naca nacc nacd nack nada nadc nadk naka nan- nana nanb nand nann nbaa nbad nbak nbbc nbca nbcc ncaa ncac ncba ncbc ncca nccc nccn ncda ncdc ncdn ncna ncnc ncnd ndaa ndak ndcc nddb ndna nndb nnnn