a-be aaaa aaab aaac aaae aaar aaba aabb aabc aaca aacb aacc aace aacr aacu aaea aaec aara aarc aare aaru abaa abab abac abae abar abau abb- abba abbb abbe abbr abca abcb abcc abcr abec abee aber abra abrc abua abue acaa acab acac acae acar acba acca accc acce accu ace- acea acec acer acr- acra acrc acre acrr acu- acue acur aeac aecb aeer aer- aera aerc arab arac arae arar arau arba arbe arc- arca arce area arec aree areu arr- arra arrc arre arrr arru arua arub arue auaa aube auca auce auer aur- aura aure baaa baar baba babb babe babr babu bac- baca bacc bace baer bar- bara barb barc bare barr baru bau- baur bbau bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcra bcru bcuc bear beau beba bebb bebe beca becu beeb beer bera berc bere berr beru beur brab brac brae brau brca brcb brce brea breb brec bree brer brrr bruc brue buar buba bubb bube bubu buca bucc buce bucu buea buer bueu bur- bura burb bure burr buru caaa caab caac caba cabe cabu cac- caca cacc cace cacr caec caer caeu cara carb carc care carr cauc cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbea cbec cbee cber cbre ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu ccee ccra ccrc ccre ccuc ceac cear ceba cebu cec- ceca cece ceeb ceec cer- cera cerc cere crab crac crar crau crbc crbu crca crcc crce crcr cre- crea creb crec cree creu crub crue cuau cub- cuba cubb cube cuca cucc cuce cuer cura curb cure curr eaba eaca eacc eaec eara earb eare ebac ebba ebbc ebbr ebcc eber ebru ebur ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce ecra ecrc ecrr ecru ecua eeca eeea eeee eera eerc erau erba erbb erbe erca ercc erce ereb erec erer erra errc erre erua erub eruc erur euba eubc euer eur- eura eurc eure raab raba rabb rabe rabu rac- raca racc race racu raec raer rara rarb rare raua raub rauc raue rbbb rbbr rcac rcbc rccb rccc rea- reac reae rear reau reba rebb rebe rebu reca recc rece recr recu reeb rera rere reru reue reuu rrrr ruba rubb rube rubu ruca ruce ruer rura rurc rure ruru uabc uaca uarc uaru uaua ubac ubar ubba ubbe uber ubra ucar ucbc ucca ucea ucrc ucua ueba urac urau urba urbe urca ure- urea urra urre urur uuuu