a-fu aaaa aaab aaac aaaf aaal aaar aaba aabb aabc aabl aaca aacb aacc aacf aacl aaco aacr aacu aafa aafb aafc aaff aafl aala aalc aall aalo aalu aaoo aara aarc aaro aaru abaa abab abac abaf abal abar abau abb- abba abbb abbo abbr abca abcb abcc abcf abcl abcr abff abla ablo aboa abob abof abol aboo abor abou abra abrc abro abua abuf abul acaa acab acac acar acba acbl acca accc accf acco accu acfc acfl acla aclc aclr aclu acoa acol acor acou acr- acra acrc acro acrr acu- acuf acul acuo acur afaa afao afar afca afcb afcc afcu affa affc affo afla aflc afoa afol afoo afor afr- afra afrc afro afru afua alaa alac alal alao alar alau alb- alba albc albo albu alca alcc alco alfa all- alla alll allo allr allu aloa aloc alof alol aloo alor alou alro alua aluf alur aoba aoca aola aora aorb aouf aoul arab arac araf aral arar arau arba arc- arca arco arfa arfb arfc arff arfu arla arlo aroa arob aroo aror arr- arra arrc arro arrr arru arua arub arul auaa auca aufc aul- aula aulf aull aulo aulu auol aur- aura auro baaa baaf baal baar baba babb babo babr babu bac- baca bacc baco bafc baff bafo bala balc balf ball balo balu baol bar- bara barb barc barf baro barr baru bau- bauf baul baur bbau bbbb bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcfc bcof bcor bcra bcru bcuc bfca bffl blaa blab blac blau blcu blfc blob bloc bloo blou blrc blub bluf blur boab boac boal boar boba bobb bobo bobu boca boco bocu bofa boff bofu bola boll bolo bolu boob booc boof bool boor bor- bora borf boro borr boru boua bouf boul bour brab brac braf brao brau brca brcb brfc brfu broa brob broc brol broo bror brou brrr bruc bual buar buba bubb bubo bubu buca bucc buco bucu bufc buff bufo bufr bula bulb bull bulu buol bur- bura burb burl buro burr buru c-bo caaa caab caac caaf caal caba cabf cabo cabu cac- caca cacc caco cacr cafa cafb cafc caff cafl cafu cala calc calf call calo calu caol caor cara carb carc carf carl caro carr cauc cauf caul cauo cbac cbal cbar cbbc cbca cbcc cbcl cbcr cbcu cbfb cbfc cblb cblc cbol cbrl ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf cccl cccu ccfa ccfc ccff ccfl ccla cclc ccob ccoc ccra ccrc ccrf ccrl ccuc cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfcl cfco cffb cffr cfoa cfor cfra cfrb clab claf clar clau clob clof cloo clor clou clra clro club coal coba cobb cobo cobu coca coco cocu cofc coff col- cola colb coll colo colu coob coof cool cor- cora corb corc corf corl coro corr coua coub coul cour crab crac craf crar crau crbc crbu crca crcc crcr crfc crfl crlf crob croc crol croo cror crub cuau cub- cuba cubb cuca cucc cufa cufc cuff cufo cula culb culc cull culo cura curb curf curl curo curr faaa faac faba fabo fabu faca facc fafa fafc faff fafo fala falc fall falo falu fara farb farc farl faro farr faru faul faur fbar fbla fcab fcal fcar fcba fcca fccf fcra ffar ffcc ffff ffrr flab flac flao flcl flob floc floo flor flou flub fluf fluo flur foaf foal foar foba foca foco fofo fola folc foll folo folr foof fool for- fora forb forl foro forr foua foul four frab frac frau frbc frcc frfc frla frob frol frou frub fuar fubb fubu fuc- fuca fufc fuff fufu fula full fulu fuor fur- fura furl furo furr laaa laac laal laar laba labo labr labu laca lacc lacl laco lacu lafb lafc laff lala lall lalo lalu laou lara larb larc larf larr laru laub lauf laul laur lbar lbcc lblr lcac lcbc lcca lccc lcfc lcfr lcor lcra lcrl lfca lfcc llao llcc lllc llll lloa lloc lloo loac loaf loar lob- loba lobb lobo loca locc loco locu lofa loff lola loll lolo loob looc loof lool loor lora loro loul lour louu lrac lral lrba lrfc lroc lrrc lrrr luau luba luca luff lufu lula lull lulu lura luua oaau oafc oafo oall oara obal obba obbo obla oblu obol obor obra obro ocab ocac ocal ocbc occa occc ocfa oclc ocra ocrl ocro ocrr ocul ocur ofcl ofcr off- offa offc offo offr offu ofla ofor ofra olac olaf olar olba olbo olca olcc olfa olla ollo olof olor olur ooaa ooba oocr ooff oola oolo oooo oora orab orac oral orao orar orba orbb orbo orbu orca orco orff orfu orla orlo orlu oro- orof oror orra orro orub ouac oucc oufc ouff oula oulu our- oura ouro ouu- raab raaf raba rabb rabl rabo rabu rac- raca racc raco racu rafa rafc raff rala ralb ralf rall ralo raob raoc raol rara rarb rarf raro raua raub rauc rauf raul rbaf rbbb rbbr rbcl rcac rcaf rcbc rcbo rccb rccc rcfc rffc rffl rlab rlua roab roaf roar rob- roba robb robo robu roca rocc roco rofc roff rofl rofo rola rolf roll rolo roob roof rool roor rora rorc roro roru roua roub rouf roul rrfc rrrr ruba rubb rubu ruca rufa rufc ruff rufo rula rull rulo rura rurc ruro ruru uabc uaca uafa uaoc uarc uaru uaua ubac ubal ubar ubba ubbo ubla ublo uboc ubra ucal ucar ucbc ucca ucfa ucfb ucla ucrc ucua ufcu uffa ufra ulaa ular ulbc ulcc ulco ulla ullo ullr ulo- uloc ulua ulul uocc uofa uofl uofo uolc uor- urac ural urao urau urba urca urfa urff urla uro- uroa urol uroo urra urur uulu uuoc uuuu