a-be aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aacr aada aadc aade aaea aaec aafa aafb aafc aafd aaff aara aarc aard aare abaa abab abac abad abae abaf abar abb- abba abbb abbe abbr abca abcb abcc abcd abcf abcr abda abec abed abee aber abff abra abrc acaa acab acac acad acae acar acba acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acer acfc acfd acfe acr- acra acrc acre acrr adaa adab adac adad adae adar adba adbc adcc adda addc addd adde addr adea adeb adee ader adfa adfc adra adre aeac aeaf aecb aede aeer aer- aera aerc aerd afaa afad afar afca afcb afcc afdb afdc afee afer affa affc afr- afra afrc afre arab arac arad arae araf arar arba arbe arc- arca arce arda ardc arde ardf area arec ared aree aref arfa arfb arfc arff arr- arra arrc arre arrr baaa baad baaf baar baba babb babe babr bac- baca bacc bace bada badb badd bade badr baed baer bafc baff bar- bara barb barc bard bare barf barr bbad bbbb bbdd bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcfc bcra bd-r bdbc bddc bead beaf bear beba bebb bebe beca beda bede beeb beed beef beer befa befe beff bera berc berd bere berr bfca brab brac brad brae braf brca brcb brce brda brea breb brec bred bree bref brer brfc brrr c-cd caaa caab caac caaf caba cabe cabf cac- caca cacc cace cacr cada cadc cadd cade cadr caec caer cafa cafb cafc cafe caff cara carb carc card care carf carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbea cbec cbee cbef cber cbfb cbfc cbrd cbre ccaa ccab ccac ccad ccaf ccar ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdr cced ccee ccfa ccfc ccfd ccff ccra ccrc ccre ccrf cd-e cd-r cdaa cdac cdad cdba cdbf cdda cddb cddr cdec cdef cder cdfa cdfe cdre ceac cead cear ceba cec- ceca cece ceda cedd cede ceeb ceec cef- cefa cefc cer- cera cerc cerd cere cerf cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cfda cffb cffr cfra cfrb cfre crab crac craf crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree crfc daab daad daae daar daba dabb daca dace dada dade daeb daer dafa dafc dafe daff dara darb darc dard dare darf darr dbar dbcc dbfc dcbc dcca dccb dccc dcdb dcfc dcra dddd ddrc ddre deac dead deae deaf dear deba debe dec- deca decc decd dece deda dedd dede deeb deed deef deer defe deff der- dera derb derc dere derf derr dfaf dfcc dfer dffa dfrf draa drab drac drad draf drar drba drbc drca drda drea dred dree dref drfc drra eaaf eaba eaca eacc eada eadb eadd eaec eafb eara earb eard eare ebac ebba ebbc ebbr ebcc ebed eber ebfc ecaa ecac ecad ecar ecbc ecbe ecca eccb eccc ecce ecdc ecdf eced ecef ecfa ecfc ecfr ecra ecrc ecrf ecrr edac edad edar edca edda eddc edde ede- edea eder edfa edra eeca eede eeea eeee eefa eefe eera eerc efab efbr efca efda effa erad eraf erba erbb erbe erca ercc erce erda erde erdf ereb erec ered erer erfc erra errc erre faaa faac faad faba fabd fabe faca facc face fada fadd fade faeb fafa fafc fafe faff fara farb farc fard fare farr fbar fcab fcar fcba fcca fccf fcda fcra fdca fead feaf fear feba fece feda fede feeb feed feer fefc fefe feff fera ferb ferc ferd fere ferr ffar ffcc ffee ffff ffrr frab frac frad frae frbc frcc frea fred free frfc raab raad raaf raba rabb rabe rac- raca racc race rada radc radd rade radr raec raed raef raer rafa rafc rafe raff rara rarb rare rarf rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcdc rcde rcfc rcrd rdac rder rdfa rea- reac read reae reaf rear reba rebb rebe reca recc recd rece recr reda redc redd rede redr reeb reed reef refd refe reff refr rera rerd rere rfae rfef rffc rrad rred rrfc rrrr