a-be aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacr aacu aada aadc aade aadu aaea aaec aara aarc aard aare aaru abaa abab abac abad abae abar abau abb- abba abbb abbe abbr abca abcb abcc abcd abcr abda abdu abec abed abee aber abra abrc abua abud abue acaa acab acac acad acae acar acba acca accc accd acce accu acda acdb acdc acde ace- acea acec aced acer acr- acra acrc acre acrr acu- acue acur adaa adab adac adad adae adar adba adbc adcc adda addc addd adde addr addu adea adeb adee ader adra adre adua adub adue adur aeac aecb aede aeer aer- aera aerc aerd arab arac arad arae arar arau arba arbe arc- arca arce arda ardc arde ardu area arec ared aree areu arr- arra arrc arre arrr arru arua arub arud arue auaa aube auca auce audc aude auer aur- aura aurd aure baaa baad baar baba babb babe babr babu bac- baca bacc bace bada badb badd bade badr badu baed baer bar- bara barb barc bard bare barr baru bau- baud baur bbad bbau bbbb bbdd bbeb bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcra bcru bcuc bd-r bdbc bddc bead bear beau beba bebb bebe beca becu beda bede bedu beeb beed beer bera berc berd bere berr beru beur brab brac brad brae brau brca brcb brce brda brea breb brec bred bree brer brrr bruc brud brue buad buar buba bubb bube bubu buca bucc buce bucu buda budb budd bude budu buea buer bueu bur- bura burb burd bure burr buru c-cd caaa caab caac caba cabe cabu cac- caca cacc cace cacr cada cadc cadd cade cadr cadu caec caer caeu cara carb carc card care carr cauc cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbdb cbdc cbea cbec cbee cber cbrd cbre ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccu ccdc ccdr cced ccee ccra ccrc ccre ccuc cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre ceac cead cear ceba cebu cec- ceca cece ceda cedd cede cedu ceeb ceec cer- cera cerc cerd cere crab crac crar crau crbc crbu crca crcc crce crcr crda crdc cre- crea creb crec cred cree creu crub crud crue cuau cub- cuba cubb cube cuca cucc cuce cuda cude cued cuer cura curb curd cure curr daab daad daae daar daau daba dabb dabu daca dace dada dade dadu daeb daer daeu dara darb darc dard dare darr daru daub daud daue daur dbar dbcc dcbc dcca dccb dccc dccu dcdb dcra dddd ddrc ddre ddub deac dead deae dear deau deba debe debu dec- deca decc decd dece deda dedd dede dedu deeb deed deer der- dera derb derc dere derr deua deue deur draa drab drac drad drar drau drba drbc drca drda drea dred dree drra drua drub drue druu duaa duab duad duar dub- duba dubb dubc dube dubu duca duce duda dudd dude dudu duer dura dure duru duur eaba eaca eacc eada eadb eadd eaec eara earb eard eare ebac ebba ebbc ebbr ebcc ebed eber ebru ebur ecaa ecac ecad ecar ecbc ecbe ecca eccb eccc ecce ecdc eced ecra ecrc ecrr ecru ecua edac edad edar edca edda eddc edde ede- edea eder edra edru educ edur eeca eede eedu eeea eeee eera eerc erad erau erba erbb erbe erca ercc erce erda erde ereb erec ered erer erra errc erre erua erub eruc erur euba eubc eucd eude euer eur- eura eurc eure raab raad raba rabb rabe rabu rac- raca racc race racu rada radc radd rade radr radu raec raed raer rara rarb rare raua raub rauc raud raue rbbb rbbr rcac rcbc rccb rccc rcdc rcde rcrd rdac rder rea- reac read reae rear reau reba rebb rebe rebu reca recc recd rece recr recu reda redc redd rede redr redu reeb reed rera rerd rere reru reue reuu rrad rred rrrr ruad ruba rubb rube rubu ruca ruce ruda rudd rude rued ruer rura rurc rurd rure ruru ruud uabc uaca uarc uaru uaua ubac ubar ubba ubbe uber ubra ubud ucad ucar ucbc ucca ucdc ucdd ucea ucrc ucua udaa udad udar udau udbc udca udea uder udra ueba ueda urac urad urau urba urbe urca urda urde urdu ure- urea ured urra urre urur uuuu