a-do a-ha aaaa aaab aaac aaad aaah aaar aaba aabb aabc aabd aabh aaca aacb aacc aacd aach aaco aacr aada aadc aaha aaoo aara aarc aard aaro abaa abab abac abad abar abb- abba abbb abbo abbr abca abcb abcc abcd abch abcr abda abdo abha abho abhr aboa abob abod aboh aboo abor abra abrc abro acaa acab acac acad acar acba acca accc accd acch acco acda acdb acdc acha achh acho achr acoa acod acoh acor acr- acra acrc acro acrr adaa adab adac adad adah adao adar adba adbc adcc adda addc addd addo addr adha adhd adho adob adoc adod adoo ador adra adro ahab ahac ahad ahah ahar ahha ahoa ahod ahor ahra ahrc ahrr aoah aoba aoca aodh aora aorb arab arac arad arah arar arba arbh arc- arca arch arco arda ardc ardo arh- aroa arob arod aroo aror arr- arra arrc arrh arro arrr baaa baad baah baar baba babb babo babr bac- baca bacc bach baco bada badb badd badh bado badr baha baho bahr baoh bar- bara barb barc bard barh baro barr bbad bbbb bbch bbdd bbdo bbrc bcaa bcar bcbc bcca bccc bcda bchd bcor bcra bd-r bdbc bddc bddh bhao bhar bhca bhcc bhor bhra boab boac boad boar boba bobb bobo boca boch boco boda bodb bodh bodo boha bohd boho bohr boob booc bood booh boor bor- bora bord borh boro borr brab brac brad brah brao brca brcb brda brdo broa brob broc brod broh broo bror brrr c-bo c-cd caaa caab caac caah caba cabo cac- caca cacc cach caco cacr cada cadc cadd cado cadr caha caod caor cara carb carc card caro carr cbac cbar cbbc cbca cbcc cbcr cbdb cbdc cbdo cbha cbrd cbrh ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc ccdc ccdh ccdr ccha cchr ccob ccoc ccod ccra ccrc cd-r cdaa cdac cdad cdba cdda cddb cddr chaa chab chac chad chah chao char chca chch chha choc chod choh choo chor chra chrb chrc chrd chro chrr coad coba cobb cobh cobo coca coch coco coda codd coha coho coob cood cooh cor- cora corb corc cord coro corr crab crac crar crbc crca crcc crcr crda crdc crob croc crod croh croo cror d-bo daab daad daar daba dabb dabo daca dada dado daha dara darb darc dard daro darr dbar dbcc dcbc dcca dccb dccc dcdb dcra dddd ddoc ddrc dhaa dhad dhao dhar dhod dhor doab doar doba dobb doca doch doco dod- doda dodd dodo doha dohc dohr doob dood door dora dorc dord doro dorr draa drab drac drad drar drba drbc drca drda drob drod droh drra haab haad haar haba habo haco hada hadh haha haho haor hara harc hard harh haro harr hbar hbcd hboc hcbc hcca hccb hccc hcch hcdr hcrd hdca hdda hdoc hdod hdra hhaa hhhh hoac hoad hoar hoba hobo hoca hoch hocr hoda hodh hodr hoha hoho hood hoor hora horc hord horo horr hrac hrad hrdc hrob hrod hrrc oara obad obba obbo obor obra obrh obro ocab ocac ocad ocbc occa occc ocha ocra ocro ocrr odac odah odbo odda oddd odoh odoo odor odra ohad ohba ohcc ohho ohob ohoh ohra ooaa ooba oocr ooda ooha ooho oooh oooo oora oord orab orac orad orah orao orar orba orbb orbo orca orch orco orda ordo oro- oror orra orro raab raad raba rabb rabo rac- raca racc rach raco rada radc radd radh rado radr raha rahr raob raoc raoh rara rarb raro rbbb rbbr rboh rcac rcbc rcbo rccb rccc rcdc rchb rcrd rdac rdoc rhoa rhob rhoc rhod rhoh roab road roar rob- roba robb robo roca rocc roch roco roda rodd rodo roha rohr roob rood roor rora rorc roro rrad rrah rrrr