a-do aaaa aaab aaac aaad aaal aaar aaba aabb aabc aabd aabl aaca aacb aacc aacd aacl aaco aacr aada aadc aala aalc aald aall aalo aaoo aara aarc aard aaro abaa abab abac abad abal abar abb- abba abbb abbo abbr abca abcb abcc abcd abcl abcr abda abdo abla ablo aboa abob abod abol aboo abor abra abrc abro acaa acab acac acad acar acba acbl acca accc accd acco acda acdb acdc acla aclc aclr acoa acod acol acor acr- acra acrc acro acrr adaa adab adac adad adal adao adar adba adbc adcc adda addc addd addl addo addr adob adoc adod adoo ador adra adro alaa alac alad alal alao alar alb- alba albc albo alca alcc alco ald- alda aldl aldo all- alla alll allo allr aloa aloc alod alol aloo alor alro aoba aoca aola aora aorb arab arac arad aral arar arba arc- arca arco arda ardc ardl ardo arla arlo aroa arob arod aroo aror arr- arra arrc arro arrr baaa baad baal baar baba babb babo babr bac- baca bacc baco bada badb badd bado badr bala balc bald ball balo baol bar- bara barb barc bard baro barr bbad bbbb bbdd bbdo bblb bbrc bcaa bcar bcbc bcca bccc bccl bcda bcor bcra bd-r bdbc bddc blaa blab blac blad bldc bldr blob bloc blod bloo blrc boab boac boad boal boar boba bobb bobo boca boco boda bodb bodo bola bold boll bolo boob booc bood bool boor bor- bora bord boro borr brab brac brad brao brca brcb brda brdo broa brob broc brod brol broo bror brrr c-bo c-cd caaa caab caac caal caba cabo cac- caca cacc caco cacr cada cadc cadd cado cadr cala calc cald call calo caod caol caor cara carb carc card carl caro carr cbac cbal cbar cbbc cbca cbcc cbcl cbcr cbdb cbdc cbdo cblb cblc cbol cbrd cbrl ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccl ccdc ccdr ccla cclc ccob ccoc ccod ccra ccrc ccrl cd-r cdaa cdac cdad cdba cdda cddb cddl cddr clab clad clar clcd cldc cldr clob clod cloo clor clra clrd clro coad coal coba cobb cobo coca coco coda codd codl col- cola colb cold coll colo coob cood cool cor- cora corb corc cord corl coro corr crab crac crar crbc crca crcc crcr crda crdc crob croc crod crol croo cror d-bo daab daad daal daar daba dabb dabo daca dada dado dala dall dalo dara darb darc dard darl daro darr dbar dbcc dcbc dcca dccb dccc dccl dcdb dcra dddd ddlc ddoc ddrc dlab dlbd dlco doab doal doar doba dobb dobl doca doco dod- doda dodd dodo dola dold doll dolo doob dood dool door dora dorc dord doro dorr draa drab drac drad drar drba drbc drca drda drob drod drol drra laaa laac laad laal laar laba labo labr laca lacc lacl laco lada ladd lado lala lald lall lalo lara larb larc lard larr lbar lbcc lblr lcac lcad lcbc lcca lccc lcdd lcdr lcor lcra lcrd lcrl llao llcc lldb lldc lllc llll lloa lloc llod lloo loac load loar lob- loba lobb lobo loca locc loco loda lola lold loll lolo loob looc lood lool loor lora lord loro lrac lral lrba lrdd lroc lrrc lrrr oall oara obad obal obba obbo obla obol obor obra obro ocab ocac ocad ocal ocbc occa occc oclc ocra ocrl ocro ocrr odac odal odbo odda oddd odla odoo odor odra odrl olac olar olba olbo olca olcc oldb olla ollo olor ooaa ooba oocr ooda oola oold oolo oooo oora oord orab orac orad oral orao orar orba orbb orbo orca orco orda ordo orla orlo oro- oror orra orro raab raad raba rabb rabl rabo rac- raca racc raco rada radc radd radl rado radr rala ralb rall ralo raob raoc raol rara rarb raro rbbb rbbr rbcl rcac rcbc rcbo rccb rccc rcdc rcrd rdac rdoc rlab roab road roar rob- roba robb robo roca rocc roco roda rodd rodo rola rold roll rolo roob rood rool roor rora rorc roro rrad rrrr