-ana aaaa aaab aaac aaan aaar aaba aabb aabc aaca aacb aacc aacn aaco aacr aana aaon aaoo aara aarc aaro abaa abab abac aban abar abb- abba abbb abbo abbr abca abcb abcc abcn abcr aboa abob abon aboo abor abra abrc abro acaa acab acac acan acar acba acca accc acco acoa acon acor acr- acra acrc acro acrr ana- anaa anab anac anan anao anar anba anbb anbo anca ancc anco anna annb anno ano- anoa anon anor anrc aoba aoca aonb aono aora aorb aorn arab arac aran arar arba arc- arca arco arna arno aroa arob aron aroo aror arr- arra arrc arro arrr baaa baan baar baba babb babo babr bac- baca bacc bacn baco bana banc bann bano banr baon bar- bara barb barc barn baro barr bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra bnoc bnor bnrr boab boac boan boar boba bobb bobo boca boco bona bonc bonn bono boob booc boon boor bor- bora born boro borr brab brac bran brao brca brcb brna brno broa brob broc bron broo bror brrr c-bo caaa caab caac caan caba cabo cac- caca cacc caco cacr cana canc cann cano caor cara carb carc carn caro carr cbac cbar cbbc cbca cbcc cbcn cbcr cbna cbrn ccaa ccab ccac ccar ccba ccbc ccbn ccca cccb cccc ccna ccnb ccnc ccnr ccob ccoc ccra ccrc cnaa cnac cnbc cnco cnna cnrc cnrr coan coba cobb cobo coca coco con- cona conc conn cono coob coon cor- cora corb corc corn coro corr crab crac cran crar crbc crca crcc crcr crna crob croc cron croo cror naaa naab naac naan naar naba nabc nabo naca nacc naco nan- nana nanb nann nano naoc naor nara narc narn naro narr nbaa nbar nbbc nbbo nbca nbcc nbco ncaa ncac ncar ncba ncbc ncca nccc nccn nccr ncna ncnc ncoa ncoc ncor ncra ncrc nnnn noaa noac noba nobc nobo noco non- nona nonn nono noo- noob noon nooo noor nor- nora norb norc norn noro norr nrab nrca nrna nroc nron nrrc oara oban obba obbo obon obor obra obro ocab ocac ocan ocbc occa occc occn ocna ocon ocra ocro ocrr onab onan onar onc- onca onco onna onno onon onor onra ooaa ooba oocr oona oooo oora orab orac oran orao orar orba orbb orbo orca orco orna ornc orno oro- oron oror orra orro raab raan raba rabb rabo rac- raca racc raco rana ranc rann rano raob raoc rara rarb raro rbbb rbbr rcac rcbc rcbo rccb rccc rcnr rcon rnbr rnco roab roan roar rob- roba robb robo roca rocc roco rona ronc rono roob roon roor rora rorc roro rrna rrrr