a-do a-fu aaaa aaab aaac aaad aaaf aaal aaar aaba aabb aabc aabd aabl aaca aacb aacc aacd aacf aacl aaco aacr aacu aada aadc aadu aafa aafb aafc aafd aaff aafl aala aalc aald aall aalo aalu aaoo aara aarc aard aaro aaru abaa abab abac abad abaf abal abar abau abb- abba abbb abbo abbr abca abcb abcc abcd abcf abcl abcr abda abdo abdu abff abla ablo aboa abob abod abof abol aboo abor abou abra abrc abro abua abud abuf abul acaa acab acac acad acar acba acbl acca accc accd accf acco accu acda acdb acdc acdf acfc acfd acfl acla aclc aclr aclu acoa acod acol acor acou acr- acra acrc acro acrr acu- acuf acul acuo acur adaa adab adac adad adal adao adar adba adbc adcc adda addc addd addl addo addr addu adfa adfc adfl adob adoc adod adoo ador adra adro adua adub adur afaa afad afao afar afca afcb afcc afcu afdb afdc afdl affa affc affo afla aflc afoa afol afoo afor afr- afra afrc afro afru afua afud alaa alac alad alal alao alar alau alb- alba albc albo albu alca alcc alco ald- alda aldl aldo alfa all- alla alll allo allr allu aloa aloc alod alof alol aloo alor alou alro alua aluf alur aoba aoca aola aora aorb aouf aoul arab arac arad araf aral arar arau arba arc- arca arco arda ardc ardf ardl ardo ardu arfa arfb arfc arff arfu arla arlo aroa arob arod aroo aror arr- arra arrc arro arrr arru arua arub arud arul auaa auca audc audo aufc aul- aula auld aulf aull aulo aulu auol aur- aura aurd auro baaa baad baaf baal baar baba babb babo babr babu bac- baca bacc baco bada badb badd bado badr badu bafc baff bafo bala balc bald balf ball balo balu baol bar- bara barb barc bard barf baro barr baru bau- baud bauf baul baur bbad bbau bbbb bbdd bbdo bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcda bcfc bcof bcor bcra bcru bcuc bd-r bdbc bddc bduf bfca bffl blaa blab blac blad blau blcu bldc bldr blfc blob bloc blod bloo blou blrc blub blud bluf blur boab boac boad boal boar boba bobb bobo bobu boca boco bocu boda bodb bodo bodu bofa bofd boff bofu bola bold boll bolo bolu boob booc bood boof bool boor bor- bora bord borf boro borr boru boua boud bouf boul bour brab brac brad braf brao brau brca brcb brda brdo brfc brfu broa brob broc brod brol broo bror brou brrr bruc brud buad bual buar buba bubb bubo bubu buca bucc buco bucu buda budb budd budl budo budu bufc buff bufo bufr bula bulb buld bull bulu buol bur- bura burb burd burl buro burr buru c-bo c-cd caaa caab caac caaf caal caba cabf cabo cabu cac- caca cacc caco cacr cada cadc cadd cado cadr cadu cafa cafb cafc caff cafl cafu cala calc cald calf call calo calu caod caol caor cara carb carc card carf carl caro carr cauc cauf caul cauo cbac cbal cbar cbbc cbca cbcc cbcl cbcr cbcu cbdb cbdc cbdo cbfb cbfc cblb cblc cbol cbrd cbrl ccaa ccab ccac ccad ccaf ccar ccba ccbc ccca cccb cccc cccf cccl cccu ccdc ccdf ccdr ccfa ccfc ccfd ccff ccfl ccla cclc ccob ccoc ccod ccra ccrc ccrf ccrl ccuc cd-r cdaa cdac cdad cdba cdbf cdda cddb cddl cddr cdfa cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfcl cfco cfda cffb cffr cfoa cfor cfra cfrb clab clad claf clar clau clcd cldc cldr clob clod clof cloo clor clou clra clrd clro club clud coad coal coba cobb cobo cobu coca coco cocu coda codd codl cofc coff col- cola colb cold coll colo colu coob cood coof cool cor- cora corb corc cord corf corl coro corr coua coub coud coul cour crab crac craf crar crau crbc crbu crca crcc crcr crda crdc crfc crfl crlf crob croc crod crol croo cror crub crud cuau cub- cuba cubb cuca cucc cuda cufa cufc cuff cufo cula culb culc culd cull culo cura curb curd curf curl curo curr d-bo daab daad daal daar daau daba dabb dabo dabu daca dada dado dadu dafa dafc daff dafo dala dalf dall dalo dalu daou dara darb darc dard darf darl daro darr daru daub daud daur dbar dbcc dbfc dbfo dcbc dcca dccb dccc dccl dccu dcdb dcfc dcra dddd ddlc ddoc ddrc ddub dfaf dfcc dfco dfcu dffa dfrf dlab dlbd dlco doab doal doar doba dobb dobl dobu doca doco docu dod- doda dodd dodo doff dola dold dolf doll dolo dolu doob dood doof dool door dora dorc dord dorf doro dorr doru doub douc doud douf doul dour draa drab drac drad draf drar drau drba drbc drca drda drfc drob drod drof drol drou drra drua drub druu duaa duab duad dual duar dub- duba dubb dubc dubu duca duco duda dudd dudo dudu dufc duff dufu dula dulc dull dulo dulu duo- dura duro duru duul duur faaa faac faad faba fabd fabo fabu faca facc fada fadd fado fafa fafc faff fafo fala falc fald fall falo falu fara farb farc fard farl faro farr faru faud faul faur fbar fbla fcab fcal fcar fcba fcca fccf fcda fcra fdca fdlr fdoa fdoc ffar ffcc ffff ffrr flab flac flad flao flcl fldr flob floc flod floo flor flou flub flud fluf fluo flur foad foaf foal foar foba foca foco foda fofo fola folc fold foll folo folr food foof fool for- fora forb ford forl foro forr foua foud foul four frab frac frad frau frbc frcc frfc frla frob frol frou frub fuad fuar fubb fubu fuc- fuca fuda fudd fufc fuff fufu fula full fulu fuor fur- fura furl furo furr laaa laac laad laal laar laba labo labr