-ana a-do aaaa aaab aaac aaad aaan aaba aabb aabc aabd aaca aacb aacc aacd aacn aaco aada aadc aana aand aaon aaoo abaa abab abac abad aban abb- abba abbb abbo abca abcb abcc abcd abcn abda abdo aboa abob abod abon aboo acaa acab acac acad acan acba acca accc accd acco acda acdb acdc acoa acod acon adaa adab adac adad adan adao adba adbc adcc adda addc addd addn addo adna adob adoc adod adon adoo ana- anaa anab anac anad anan anao anba anbb anbo anca ancc anco and- anda ando anna annb anno ano- anoa anod anon aoba aoca aonb aono baaa baad baan baba babb babo bac- baca bacc bacn baco bada badb badd bado bana banc band bann bano baon bbad bbbb bbdd bbdo bcaa bcbc bcca bccc bcda bdbc bddc bdna bnoc boab boac boad boan boba bobb bobo boca boco boda bodb bodo bona bonc bond bonn bono boob booc bood boon c-bo c-cd caaa caab caac caan caba cabo cac- caca cacc caco cada cadc cadd cado cana canc cand cann cano caod cbac cbbc cbca cbcc cbcn cbdb cbdc cbdn cbdo cbna cbnd ccaa ccab ccac ccad ccba ccbc ccbn ccca cccb cccc ccdc ccdn ccna ccnb ccnc ccob ccoc ccod cdaa cdac cdad cdba cdda cddb cdna cdnb cdnc cdon cnaa cnac cnbc cnco cnda cndd cnna coad coan coba cobb cobo coca coco coda codd con- cona conc cond conn cono coob cood coon d-bo d-na daab daad daan daba dabb dabo daca dada dado dana dand dann dano daon dbcc dcbc dcca dccb dccc dcdb dcon dddd ddoc dnaa dnab dnac dnad dnan dnoc doab doan doba dobb doca doco dod- doda dodd dodo dona donc dond donn dono doob dood doon naaa naab naac naad naan naba nabc nabo naca nacc nacd naco nada nadc nan- nana nanb nand nann nano naoc nbaa nbad nbbc nbbo nbca nbcc nbco ncaa ncac ncba ncbc ncca nccc nccn ncda ncdc ncdn ncna ncnc ncnd ncoa ncoc ndaa ndao ndcc nddb nddo ndna ndoc nndb nnnn noaa noac noba nobc nobo noco noda nodo non- nona nonn nono noo- noob noon nooo obad oban obba obbo obon ocab ocac ocad ocan ocbc occa occc occn ocna ocon odac odbo odda oddd odnb odon odoo onab onan onc- onca oncd onco onda ondo onna onno onod onon ooaa ooba ooda oona oooo