a-ha aaaa aaab aaac aaaf aaah aaar aaba aabb aabc aabh aaca aacb aacc aacf aach aaco aacr aafa aafb aafc aaff aaha aaoo aara aarc aaro abaa abab abac abaf abar abb- abba abbb abbo abbr abca abcb abcc abcf abch abcr abff abha abho abhr aboa abob abof aboh aboo abor abra abrc abro acaa acab acac acar acba acca accc accf acch acco acfc acha achh acho achr acoa acoh acor acr- acra acrc acro acrr afaa afao afar afca afcb afcc afch affa affc affo afoa afoo afor afr- afra afrc afro ahab ahac ahah ahar ahfa ahha ahoa ahor ahra ahrc ahrr aoah aoba aoca aora aorb arab arac araf arah arar arba arbh arc- arca arch arco arfa arfb arfc arff arh- aroa arob aroo aror arr- arra arrc arrh arro arrr baaa baaf baah baar baba babb babo babr bac- baca bacc bach baco bafc baff bafo baha baho bahr baoh bar- bara barb barc barf barh baro barr bbbb bbch bbfc bbrc bcaa bcar bcbc bcca bccc bcfc bcof bcor bcra bfca bhao bhar bhca bhcc bhff bhor bhra boab boac boar boba bobb bobo boca boch boco bofa boff bofh boha boho bohr boob booc boof booh boor bor- bora borf borh boro borr brab brac braf brah brao brca brcb brfc broa brob broc broh broo bror brrr c-bo caaa caab caac caaf caah caba cabf cabo cac- caca cacc cach caco cacr cafa cafb cafc caff caha caor cara carb carc carf caro carr cbac cbar cbbc cbca cbcc cbcr cbfb cbfc cbha cbrh ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf ccfa ccfc ccff ccha cchr ccob ccoc ccra ccrc ccrf cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfco cffb cffr cfoa cfor cfra cfrb chaa chab chac chaf chah chao char chca chch chfa chfc chfr chha choc choh choo chor chra chrb chrc chrf chro chrr coba cobb cobh cobo coca coch coco cofc coff coha coho coob coof cooh cor- cora corb corc corf coro corr crab crac craf crar crbc crca crcc crcr crfc crob croc croh croo cror faaa faac faah faba fabo faca facc fach fafa fafc faff fafo faha fahr fara farb farc faro farr fbar fcab fcar fcba fcca fccf fcch fcra ffar ffcc ffff ffrr foaf foar foba foca foch foco fofo fohr foof for- fora forb foro forr frab frac frbc frcc frfc frob froh haab haaf haar haba habo haco hafb haff haha haho haor hara harc harf harh haro harr hbar hbfc hboc hcbc hcca hccb hccc hcch hcfa hcfc hfba hhaa hhhh hhof hoac hoar hoba hobo hoca hoch hocr hoff hoha hoho hoof hoor hora horc horo horr hrac hrfc hrob hrrc oafc oafo oara obba obbo obor obra obrh obro ocab ocac ocbc occa occc ocfa ocha ocra ocro ocrr ofah ofcr off- offa offc offh offo offr ofor ofra ohba ohcc ohho ohob ohoh ohra ooaa ooba oocr ooff ooha ooho oooh oooo oora orab orac orah orao orar orba orbb orbo orca orch orco orff oro- orof oror orra orro raab raaf raba rabb rabo rac- raca racc rach raco rafa rafc raff raha rahr raob raoc raoh rara rarb rarf raro rbaf rbbb rbbr rboh rcac rcaf rcbc rcbo rccb rccc rcfc rchb rffc rhoa rhob rhoc rhoh roab roaf roar rob- roba robb robo roca rocc roch roco rofc roff rofo roha rohr roob roof roor rora rorc roro rrah rrfc rrrr