a-be aaaa aaab aaac aaae aaaf aaar aaba aabb aabc aaca aacb aacc aace aacf aacr aaea aaec aafa aafb aafc aaff aara aarc aare abaa abab abac abae abaf abar abb- abba abbb abbe abbr abca abcb abcc abcf abcr abec abee aber abff abra abrc acaa acab acac acae acar acba acca accc acce accf ace- acea acec acer acfc acfe acr- acra acrc acre acrr aeac aeaf aecb aeer aer- aera aerc afaa afar afca afcb afcc afee afer affa affc afr- afra afrc afre arab arac arae araf arar arba arbe arc- arca arce area arec aree aref arfa arfb arfc arff arr- arra arrc arre arrr baaa baaf baar baba babb babe babr bac- baca bacc bace baer bafc baff bar- bara barb barc bare barf barr bbbb bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcec bcer bcfc bcra beaf bear beba bebb bebe beca beeb beef beer befa befe beff bera berc bere berr bfca brab brac brae braf brca brcb brce brea breb brec bree bref brer brfc brrr caaa caab caac caaf caba cabe cabf cac- caca cacc cace cacr caec caer cafa cafb cafc cafe caff cara carb carc care carf 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 ccra ccrc ccre ccrf ceac cear ceba cec- ceca cece ceeb ceec cef- cefa cefc cer- cera cerc cere cerf cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cffb cffr cfra cfrb cfre crab crac craf crar crbc crca crcc crce crcr cre- crea creb crec cree crfc eaaf eaba eaca eacc eaec eafb eara earb eare ebac ebba ebbc ebbr ebcc eber ebfc ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecef ecfa ecfc ecfr ecra ecrc ecrf ecrr eeca eeea eeee eefa eefe eera eerc efab efbr efca effa eraf erba erbb erbe erca ercc erce ereb erec erer erfc erra errc erre faaa faac faba fabe faca facc face faeb fafa fafc fafe faff fara farb farc fare farr fbar fcab fcar fcba fcca fccf fcra feaf fear feba fece feeb feer fefc fefe feff fera ferb ferc fere ferr ffar ffcc ffee ffff ffrr frab frac frae frbc frcc frea free frfc raab raaf raba rabb rabe rac- raca racc race raec raef raer rafa rafc rafe raff rara rarb rare rarf rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcfc rea- reac reae reaf rear reba rebb rebe reca recc rece recr reeb reef refe reff refr rera rere rfae rfef rffc rrfc rrrr