a-fu aaaa aaac aaad aaaf aaar aaca aacc aacd aacf aacr aacu aada aadc aadu aafa aafc aafd aaff aara aarc aard aaru acaa acac acad acar acca accc accd accf accu acda acdc acdf acfc acfd acr- acra acrc acrr acu- acuf acur adaa adac adad adar adcc adda addc addd addr addu adfa adfc adra adua adur afaa afad afar afca afcc afcu afdc affa affc afr- afra afrc afru afua afud arac arad araf arar arau arc- arca arda ardc ardf ardu arfa arfc arff arfu arr- arra arrc arrr arru arua arud auaa auca audc aufc aur- aura aurd c-cd caaa caac caaf cac- caca cacc cacr cada cadc cadd cadr cadu cafa cafc caff cafu cara carc card carf carr cauc cauf ccaa ccac ccad ccaf ccar ccca cccc cccf cccu ccdc ccdf ccdr ccfa ccfc ccfd ccff ccra ccrc ccrf ccuc cd-r cdaa cdac cdad cdda cddr cdfa cfaa cfac cfar cfca cfcf cfda cffr cfra crac craf crar crau crca crcc crcr crda crdc crfc crud cuau cuca cucc cuda cufa cufc cuff cura curd curf curr daad daar daau daca dada dadu dafa dafc daff dara darc dard darf darr daru daud daur dcca dccc dccu dcfc dcra dddd ddrc dfaf dfcc dfcu dffa dfrf draa drac drad draf drar drau drca drda drfc drra drua druu duaa duad duar duca duda dudd dudu dufc duff dufu dura duru duur faaa faac faad faca facc fada fadd fafa fafc faff fara farc fard farr faru faud faur fcar fcca fccf fcda fcra fdca ffar ffcc ffff ffrr frac frad frau frcc frfc fuad fuar fuc- fuca fuda fudd fufc fuff fufu fur- fura furr raad raaf rac- raca racc racu rada radc radd radr radu rafa rafc raff rara rarf raua rauc raud rauf rcac rcaf rccc rcdc rcfc rcrd rdac rdfa rffc rrad rrfc rrrr ruad ruca ruda rudd rufa rufc ruff rura rurc rurd ruru ruud uaca uafa uarc uaru uaua ucad ucar ucca ucdc ucdd ucfa ucrc ucua udaa udad udar udau udca udra ufcu uffa ufra urac urad urau urca urda urdu urfa urff urra urur uuuu