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 abax abb- abba abbb abbo abbr abca abcb abcc abcd abcr abda abdo aboa abob abod aboo abor abox 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 adox adra adro aoba aoca aora aorb arab arac arad arar arax arba arc- arca arco arda ardc ardo aroa arob arod aroo aror arr- arra arrc arro arrr axar axo- axoa axxo ba-x baaa baad baar baba babb babo babr bac- baca bacc baco bada badb badd bado badr bar- bara barb barc bard baro barr barx bbad bbbb bbdd bbdo bbox 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 boox bor- bora bord boro borr boxa brab brac brad brao brax brca brcb brda brdo broa brob broc brod broo bror brox 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 carx caxa cbac cbar cbax cbbc cbca cbcc cbcr cbdb cbdc cbdo cbox cbrd cbxa ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc ccdc ccdr ccob ccoc ccod ccra ccrc cd-r cdaa cdac cdad cdax cdba cdda cddb cddr coad coax coba cobb cobo coca coco coda codd coob cood cor- cora corb corc cord coro corr coxa crab crac crar crax crbc crca crcc crcr crda crdc crob croc crod croo cror cxro cxxx 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 dcxx dddd ddoc ddrc do-x doab doar doba dobb doca doco dod- doda dodd dodo doob dood door dora dorc dord doro dorr doxa draa drab drac drad drar drax drba drbc drca drda drob drod drra dxab dxbc dxbr dxcb dxcc dxco dxdc dxdr dxoc dxra dxrd dxrr dxrx dxxr dxxx oara obad obba obbo obor obox obra obro ocab ocac ocad ocbc occa occc ocra ocro ocrr odac odax 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 oxa- oxo- oxox oxxo raab raad raba rabb rabo rac- raca racc raco rada radc radd rado radr radx raob raoc rara rarb raro raxa 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 roox rora rorc roro roxa roxo rrad rrrr xaar xado xara xbar xbcd xbox xbra xdcc xobc xoca xoco xoro xoxo xrcd xrdb xrod xxxo xxxx