a-be aaaa aaab aaac aaae aaaf aaar aaba aabb aabc aaca aacb aacc aace aacf aaco aacr aaea aaec aafa aafb aafc aaff aaoe aaoo aara aarc aare aaro abaa abab abac abae abaf abar abb- abba abbb abbe abbo abbr abca abcb abcc abcf abcr abec abee aber abff aboa abob abof aboo abor abra abrc abro acaa acab acac acae acar acba acca accc acce accf acco ace- acea acec acer acfc acfe acoa acoe acor acr- acra acrc acre acro acrr aeac aeaf aecb aeer aer- aera aerc aero afaa afao afar afca afcb afcc afee afer affa affc affo afoa afoe afoo afor afr- afra afrc afre afro aoba aoca aoce aora aorb arab arac arae araf arar arba arbe arc- arca arce arco area arec aree aref areo arfa arfb arfc arff aroa arob aroe aroo aror arr- arra arrc arre arro arrr baaa baaf baar baba babb babe babo babr bac- baca bacc bace baco baer bafc baff bafo bar- bara barb barc bare barf baro barr bbbb bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcec bcer bcfc bcof bcor bcra beaf bear beba bebb bebe bebo beca beeb beef beer befa befe beff befo beo- beof beor bera berc bere bero berr bfca boab boac boar boba bobb bobe bobo boca boce boco boea boec boee boef boeo boer bofa bofe boff boob booc booe boof boor bor- bora bore borf boro borr brab brac brae braf brao brca brcb brce brea breb brec bree bref breo brer brfc broa brob broc broe broo bror brrr c-bo caaa caab caac caaf caba cabe cabf cabo cac- caca cacc cace caco cacr caec caer cafa cafb cafc cafe caff caor cara carb carc care carf caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cbef cber cbfb cbfc cbre ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf ccee ccfa ccfc ccff ccob ccoc ccra ccrc ccre ccrf ceac cear ceba cec- ceca cece ceco ceeb ceec cef- cefa cefc ceor cer- cera cerc cere cerf cero cfaa cfab cfac cfae cfao cfar cfbc cfbr cfca cfcb cfcf cfco cffb cffr cfoa cfor cfra cfrb cfre coba cobb cobe cobo coca coce coco cofc cofe coff coob coof cor- cora corb corc core corf coro corr crab crac craf crar crbc crca crcc crce crcr cre- crea creb crec cree creo crfc crob croc croe croo cror eaaf eaba eaca eacc eaec eafb eara earb eare earo ebac ebba ebbc ebbo ebbr ebcc eber ebfc eboe eboo ebor ebro ecaa ecac ecao ecar ecbc ecbe ecca eccb eccc ecce ecco ecef ecfa ecfc ecfr eco- ecra ecrc ecrf ecrr eeca eeea eeee eefa eefe eeoc eera eerc eero efab efbr efca efco efeo effa efor eora eore eraf erba erbb erbe erca ercc erce ereb erec erer erfc erob eroc eroe eroo erra errc erre erro faaa faac faba fabe fabo faca facc face faeb fafa fafc fafe faff fafo fara farb farc fare faro farr fbar fcab fcar fcba fcca fccf fcra feaf fear feba febo fece feeb feer fefc fefe feff fefo feof fera ferb ferc fere fero ferr ffar ffcc ffee ffff ffrr foaf foar foba foca foce foco foer fofo foof for- fora forb fore foro forr frab frac frae frbc frcc frea free freo frfc frob froe o-eo oaer oafc oafo oara oare obba obbo obea obec ober oboe obor obra obre obro ocab ocac ocbc occa occc oce ocee ocef ocfa ocra ocre ocro ocrr oec- oeca oecc oeec oera oere ofcr ofer off- offa offc offe offo offr ofor ofra ofre ooaa ooba oobe oocr ooer ooff oooo oora oore orab orac orae orao orar orba orbb orbe orbo orca orce orco ore- orea oreb orec oreo orer orfe orff oro- oroe orof oror orra orro raab raaf raba rabb rabe rabo rac- raca racc race raco raec raef raer rafa rafc rafe raff raob raoc rara rarb rare rarf raro rbaf rbbb rbbr rcac rcaf rcbc rcbo rccb rccc rcfc rea- reac reae reaf reao rear reba rebb rebe rebo reca recc rece recr reeb reef refe reff refr reof rera rere rero rfae rfef rffc roab roaf roar rob- roba robb robe robo roca rocc roce roco roea roer rofc rofe roff rofo roob roof roor rora rorc rore roro rrfc rrrr