a-do aaaa aaab aaac aaad aaar aaba aabb aabc aabd aaca aacb aacc aacd aaco aacr aada aadc aaoo aara aarc aard aaro abaa abab abac abad abar abb- abba abbb abbo abbr abca abcb abcc abcd abcr abda abdo aboa abob abod aboo abor abra abrc abro acaa acab acac acad acar acba acca accc accd acco acda acdb acdc acoa acod acor acr- acra acrc acro acrr adaa adab adac adad adao adar adba adbc adcc adda addc addd addo addr adob adoc adod adoo ador adra adro aoba aoca aora aorb arab arac arad arar arba arc- arca arco arda ardc ardo aroa arob arod aroo aror arr- arra arrc arro arrr baaa baad baar baba babb babo babr bac- baca bacc baco bada badb badd bado badr bar- bara barb barc bard baro barr bbad bbbb bbdd bbdo bbrc bcaa bcar bcbc bcca bccc bcda bcor bcra bd-r bdbc bddc boab boac boad boar boba bobb bobo boca boco boda bodb bodo boob booc bood boor bor- bora bord boro borr brab brac brad brao brca brcb brda brdo broa brob broc brod broo bror brrr c-bo c-cd caaa caab caac caba cabo cac- caca cacc caco cacr cada cadc cadd cado cadr caod caor cara carb carc card caro carr cbac cbar cbbc cbca cbcc cbcr cbdb cbdc cbdo cbrd ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc ccdc ccdr ccob ccoc ccod ccra ccrc cd-r cdaa cdac cdad cdba cdda cddb cddr coad coba cobb cobo coca coco coda codd coob cood cor- cora corb corc cord coro corr crab crac crar crbc crca crcc crcr crda crdc crob croc crod croo cror d-bo daab daad daar daba dabb dabo daca dada dado dara darb darc dard daro darr dbar dbcc dcbc dcca dccb dccc dcdb dcra dddd ddoc ddrc doab doar doba dobb doca doco dod- doda dodd dodo doob dood door dora dorc dord doro dorr draa drab drac drad drar drba drbc drca drda drob drod drra oara obad obba obbo obor obra obro ocab ocac ocad ocbc occa occc ocra ocro ocrr odac odbo odda oddd odoo odor odra ooaa ooba oocr ooda oooo oora oord orab orac orad orao orar orba orbb orbo orca orco orda ordo oro- oror orra orro raab raad raba rabb rabo rac- raca racc raco rada radc radd rado radr raob raoc rara rarb raro rbbb rbbr rcac rcbc rcbo rccb rccc rcdc rcrd rdac rdoc roab road roar rob- roba robb robo roca rocc roco roda rodd rodo roob rood roor rora rorc roro rrad rrrr