a-be aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aabt aaca aacb aacc aacd aace aacr aact aada aadc aade aadt aaea aaec aara aarc aard aare aart aata aatc aatt abaa abab abac abad abae abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcd abcr abct abda abec abed abee aber abet abra abrc abta ac-t acaa acab acac acad acae acar acat acba acca accc accd acce acct acda acdb acdc acde acdt ace- acea acec aced acer acet acr- acra acrc acre acrr acta actc acte actt adaa adab adac adad adae adar adat adba adbc adcc adda addc addd adde addr adea adeb adee ader adet adra adre adta aeac aecb aect aede aedt aeer aer- aera aerc aerd aeta aetc aetr aett arab arac arad arae arar arat arba arbe arc- arca arce arct arda ardc arde area arec ared aree aret arr- arra arrc arre arrr arrt arta artc arte artr at-t ataa atab atac atad atae atar atat atca atcc atcr atdt atea atec ated atee ater atra atrc atre atta atte attr baaa baad baar baat baba babb babe babr bac- baca bacc bace bact bada badb badd bade badr baed baer bar- bara barb barc bard bare barr bart bata batc bate batt bbad bbbb bbdd bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcda bcde bcec bcer bcet bcra bctc bd-r bdbc bddc bead bear beat beba bebb bebe beca beda bede beeb beed beer beet bera berc berd bere berr bert beta betc bete bett brab brac brad brae brat brca brcb brce brda brdt brea breb brec bred bree brer bret brrr brtc btaa btcc btdt btec btrc btrt bttb c-cd caaa caab caac caat caba cabe cac- caca cacc cace cacr cada cadc cadd cade cadr caec caer cara carb carc card care carr cart cat- cata catb catc catd cate catt cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbdb cbdc cbea cbec cbee cber cbet cbrd cbre cbrt cbta cbtc ccaa ccab ccac ccad ccar ccat ccba ccbc ccca cccb cccc ccdc ccdr cced ccee ccra ccrc ccre ccrt cctb cctc cctt cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre ceac cead cear ceat ceba cec- ceca cece cect ceda cedd cede cedt ceeb ceec cer- cera cerc cerd cere cert cet- ceta cete crab crac crar crat crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree cret crrt crtc ctab ctae ctba ctca ctec ctrc ctta daab daad daae daar daba dabb dabt daca dace dact dada dade daeb daer dara darb darc dard dare darr dart data date datr datt dbar dbcc dbtt dcbc dcca dccb dccc dcct dcdb dcra dctc dddd ddrc ddre deac dead deae dear deba debe debt dec- deca decc decd dece dect deda dedd dede deeb deed deer deet der- dera derb derc dere derr deta dete detr draa drab drac drad drar drat drba drbc drca drda drea dred dree dret drra dtaa dtac dtcc dted eaba eaca eacc eada eadb eadd eaec eara earb eard eare eart eata eate ebac ebba ebbc ebbr ebcc ebed eber ecaa ecac ecad ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecdc eced ecra ecrc ecrr ect- ecta ectc edac edad edar edca edda eddc edde ede- edea eder edra edta eeca eede eeea eeee eera eerc eeta eetc eete erad erat erba erbb erbe erca ercc erce erda erde ereb erec ered erer eret erra errc erre erta etat etbc etbr etcc etec etee eter etra etre etta ette raab raad raat raba rabb rabe rac- raca racc race ract rada radc radd rade radr radt raec raed raer rara rarb rare rata rate ratt rbbb rbbr rcac rcbc rccb rccc rcdc rcde rcet rcrd rctc rdac rder rea- reac read reae rear reat reba rebb rebe reca recc recd rece recr rect reda redc redd rede redr reeb reed reet rera rerd rere rert reta retd rete retr rett rrad rrat rred rrrr rtca rtcc rtce rtdt rtee taa- taar taat taba tabb tabc tabe taca tacc tace tact tada tade taec taer tara tarb tarc tard tare tarr tart tata tatb tate tatr tatt tbar tbca tbcb tbcc tbcd tbce tbrb tbta tcad tcca tccc tcdd tctc tdac tddb tdra teac tead tear teat teba teca tecr tect teda tedd tede teec teed teer teet ter- tera terc tere terr teta tete tetr tett traa trab trac trad trae trat trca trcc tre- trea trec tred tree tret trra trtc trte trtr ttab ttbb tter tttt