a-be aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aabt aaca aacb aacc aacd aace aacf aacr aact aada aadc aade aadt aaea aaec aafa aafb aafc aafd aaff aara aarc aard aare aart aata aatc aatf aatt abaa abab abac abad abae abaf abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcd abcf abcr abct abda abec abed abee aber abet abff abra abrc abta ac-t acaa acab acac acad acae acar acat acba acca accc accd acce accf acct acda acdb acdc acde acdf acdt ace- acea acec aced acer acet acfc acfd acfe acft acr- acra acrc acre acrr acta actc acte actf actt adaa adab adac adad adae adar adat adba adbc adcc adda addc addd adde addr adea adeb adee ader adet adfa adfc adra adre adta aeac aeaf aecb aect aede aedt aeer aer- aera aerc aerd aeta aetc aetf aetr aett afaa afad afar afat afca afcb afcc afdb afdc afee afer afet affa affc afft afr- afra afrc afre afta aftc afte arab arac arad arae araf arar arat arba arbe arc- arca arce arct arda ardc arde ardf area arec ared aree aref aret arfa arfb arfc arff arft arr- arra arrc arre arrr arrt arta artc arte artr at-t ataa atab atac atad atae atar atat atca atcc atcf atcr atdt atea atec ated atee atef ater atfb atfc atfe atra atrc atre atta atte attr baaa baad baaf baar baat baba babb babe babr bac- baca bacc bace bact bada badb badd bade badr baed baer bafc baff baft bar- bara barb barc bard bare barf barr bart bata batc bate batf batt bbad bbbb bbdd bbeb bbet bbfc bbrc bcaa bcar bcat bcbc bcca bccc bcda bcde bcec bcer bcet bcfc bcra bctc bd-r bdbc bddc bead beaf bear beat beba bebb bebe beca beda bede beeb beed beef beer beet befa befe beff beft bera berc berd bere berr bert beta betc bete bett bfca bfta bftt brab brac brad brae braf brat brca brcb brce brda brdt brea breb brec bred bree bref brer bret brfc brrr brtc btaa btaf btcc btdt btec btfc btrc btrt bttb c-cd caaa caab caac caaf caat 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 cart cat- cata catb catc catd cate catf catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbdb cbdc cbea cbec cbee cbef cber cbet cbfb cbfc cbrd cbre cbrt cbta cbtc cbtf ccaa ccab ccac ccad ccaf ccar ccat ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdr cced ccee ccfa ccfc ccfd ccff ccra ccrc ccre ccrf ccrt cctb cctc cctt cd-e cd-r cdaa cdac cdad cdba cdbf cdda cddb cddr cdec cdef cder cdfa cdfe cdre ceac cead cear ceat ceba cec- ceca cece cect ceda cedd cede cedt ceeb ceec cef- cefa cefc cer- cera cerc cerd cere cerf cert cet- ceta cete cfaa cfab cfac cfae cfar cfbc cfbr cfbt cfca cfcb cfcf cfda cffb cffr cfra cfrb cfre cfrt cfta cftc cfte cftr crab crac craf crar crat crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree cret crfc crrt crtc crtf ctab ctae ctba ctca ctcf ctec ctfc ctrc ctta daab daad daae daar daba dabb dabt daca dace dact dada dade daeb daer dafa dafc dafe daff daft dara darb darc dard dare darf darr dart data date datr datt dbar dbcc dbfc dbtt dcbc dcca dccb dccc dcct dcdb dcfc dcra dctc dddd ddrc ddre deac dead deae deaf dear deba debe debt dec- deca decc decd dece dect deda dedd dede deeb deed deef deer deet defe deff deft der- dera derb derc dere derf derr deta dete detr dfaf dfcc dfdt dfer dffa dfrf dftr draa drab drac drad draf drar drat drba drbc drca drda drea dred dree dref dret drfc drra dtaa dtac dtcc dted dtfc eaaf eaba eaca eacc eada eadb eadd eaec eafb eara earb eard eare eart eata eate ebac ebba ebbc ebbr ebcc ebed eber ebfc ecaa ecac ecad ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecdc ecdf eced ecef ecfa ecfc ecfr ecra ecrc ecrf ecrr ect- ecta ectc ectf edac edad edar edca edda eddc edde ede- edea eder edfa edra edta eeca eede eeea eeee eefa eefe eera eerc eeta eetc eete efab efbr efca efda efet effa eft- efta erad eraf erat erba erbb erbe erca ercc erce erda erde erdf ereb erec ered erer eret erfc erft erra errc erre erta etat etbc etbr etcc etec etee eter etfa etfb etfc etfe etra etre etta ette faaa faac faad faba fabd fabe faca facc face fact fada fadd fade faeb fafa fafc fafe faff fara farb farc fard fare farr fart fata fatc fate fatf fatt fbar fcab fcar fcat fcba fcca fccf fcda fcra fdca fdtc fead feaf fear feat feba fece fect feda fede feeb feed feer feet fefc fefe feff fera ferb ferc ferd fere ferr fert feta fete fetr fett ffar ffcc ffee ffff ffrr fftf frab frac frad frae frat frbc frcc frea fred free fret frfc frta ft-c ftcd ftea fter ftfc raab raad raaf raat raba rabb rabe rac- raca racc race ract rada radc radd rade radr radt raec raed raef raer rafa rafc rafe raff raft rara rarb rare rarf rata rate ratf ratt rbaf rbbb rbbr rcac rcaf rcbc rccb rccc rcdc rcde rcet rcfc rcrd rctc rdac rder rdfa rea- reac read reae reaf rear reat reba rebb rebe reca recc recd rece recr rect reda redc redd rede redr reeb reed reef reet refd refe reff refr reft rera rerd rere rert reta retd rete retr rett rfae rfef rffc rftc rrad rrat rred rrfc rrrr rtbf rtca rtcc rtce rtdt rtee rtfb rtfc taa- taaf taar taat taba