a-be aaaa aaab aaac aaae aaaf aaal aaar aaba aabb aabc aabl aaca aacb aacc aace aacf aacl aacr aaea aaec aafa aafb aafc aaff aafl aala aalc aale aall aara aarc aare abaa abab abac abae abaf abal abar abb- abba abbb abbe abbr abca abcb abcc abcf abcl abcr abec abee abel aber abff abla able abra abrc acaa acab acac acae acar acba acbl acca accc acce accf ace- acea acec acel acer acfc acfe acfl acla aclc acle aclr acr- acra acrc acre acrr aeac aeaf aecb aecl aeer aela aelc aer- aera aerc afaa afar afca afcb afcc afee afel afer affa affc afla aflc afle afr- afra afrc afre alaa alac alae alal alar alb- alba albc albe alca alcc alce alea alec alee alef aler alfa alfe all- alla alle alll allr arab arac arae araf aral arar arba arbe arc- arca arce area arec aree aref arel arfa arfb arfc arff arla arle arr- arra arrc arre arrr baaa baaf baal baar baba babb babe babr bac- baca bacc bace bael baer bafc baff bala balc bale balf ball bar- bara barb barc bare barf barr bbbb bbeb bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcec bcer bcfc bcra beaf beal bear beba bebb bebe beca beeb beef beel beer befa befe beff bela bele bell bera berc bere berr bfca bffl blaa blab blac blae blea bleb blee blfc blrc brab brac brae braf brca brcb brce brea breb brec bree bref brel brer brfc brrr caaa caab caac caaf caal caba cabe cabf cac- caca cacc cace cacr caec caer cafa cafb cafc cafe caff cafl cala calc cale calf call cara carb carc care carf carl carr cbac cbal cbar cbbc cbca cbcc cbce cbcl cbcr cbea cbec cbee cbef cber cbfb cbfc cblb cblc cbre cbrl ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf cccl ccee ccel ccfa ccfc ccff ccfl ccla cclc ccra ccrc ccre ccrf ccrl ceac ceal cear ceba cec- ceca cece ceeb ceec ceel cef- cefa cefc cel- cela celc cele celf cell cer- cera cerc cere cerf cerl cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cfcl cffb cffr cfra cfrb cfre clab claf clar clea clec clee clef cler clra crab crac craf crar crbc crca crcc crce crcr cre- crea creb crec cree crfc crfl crlf e-cl e-la eaaf eaba eaca eacc eaec eafb eala ealc eale eara earb eare earl ebac ebal ebba ebbc ebbr ebcc ebel eber ebfc ebla ecaa ecac ecal ecar ecbc ecbe ecca eccb eccc ecce eccl ecef ecfa ecfc ecfr ecla ecra ecrc ecrf ecrl ecrr eeca eeea eeee eefa eefe eefl eele eera eerc efab efbr efca effa efla el-b elab elac elal elar elba elbe elca elcb elce elea elec elee elef eler elfa elfc elfe ella elle elra eraf eral erba erbb erbe erca ercc erce ereb erec erel erer erfc erla erle erll erra errc erre faaa faac faba fabe faca facc face faeb fafa fafc fafe faff fala falc fale fall fara farb farc fare farl farr fbar fbla fble fcab fcal fcar fcba fcca fccf fcra feaf feal fear feba fece feeb feel feer fefc fefe feff fela fele felf fell fera ferb ferc fere ferr ffar ffcc ffee ffff ffrr flab flac flae flcl flea flee fler frab frac frae frbc frcc frea free frfc frla laaa laac laal laar laba labe labr laca lacc lace lacl lael laer lafb lafc lafe laff lala lale lall lara larb larc lare larf larr lbar lbcc lblr lcac lcbc lcca lccc lcce lcer lcfc lcfr lcra lcrl leaa leaf leal lear leba leca lece leea leef leel leer lefa lefe leff lela lele lell lera lerc lere lfca lfcc llcc llef lllc llll lrac lral lrba lrfc lrrc lrrr raab raaf raba rabb rabe rabl rac- raca racc race raec raef rael raer rafa rafc rafe raff rala ralb rale ralf rall rara rarb rare rarf rbaf rbbb rbbr rbcl rble rcac rcaf rcbc rccb rccc rcfc rcle rea- reac reae reaf real rear reba rebb rebe reca recc rece recr reeb reef reel refe reff refl refr rela relb rele rell rera rere rfae rfef rffc rffl rlab rlee rlef rrfc rrle rrrr