-er a-a a-b a-c aaa aab aac aad aae aar aau ab- aba abb abc abd abe abr abu ac- aca acb acc acd ace acr acu ad- ada adb adc add ade adr adu aea aeb aec aed aee aer aeu ar- ara arb arc ard are arr aru au- aua aub auc aud aue aur b-u baa bab bac bad bae bar bau bba bbb bbc bbd bbe bbr bbu bca bcb bcc bcd bce bcr bcu bda bdb bdc bdd bde bdr bdu be- bea beb bec bed bee ber beu bra brb brd bre brr bru bua bub buc bud bue bur buu c-- caa cab cac cad cae car cau cba cbb cbc cbd cbe cbr cbu cca ccb ccc ccd cce ccr ccu cda cdb cdc cdd cde cdr cdu ce- cea ceb cec ced cee cer ceu cra crb crc crd cre crr cru cua cub cuc cud cue cur cuu daa dab dac dad dae dar dau dba dbb dbc dbd dbe dbr dbu dca dcb dcc dcd dce dcr dcu dda ddb ddc ddd dde ddr ddu de- dea deb dec ded dee der deu dra drb drc drd dre drr dru dua dub duc dud due dur eaa eab eac ead eae ear eau eba ebb ebc ebd ebe ebr ebu ec- eca ecb ecc ecd ece ecr ecu ed- eda edb edc edd ede edr edu eea eeb eec eed eee eer era erb erc erd ere err eru eu- eua eub euc eud eue eur ra- raa rab rac rad rae rar rau rba rbb rbc rbd rbe rbr rbu rca rcb rcc rcd rce rcr rcu rda rdb rdc rdd rde rdr rdu re- rea reb rec red ree rer reu rra rrb rrc rrd rrr rru rua rub ruc rud rue rur ruu ua- uaa uab uac uad uae uar uau uba ubb ubc ube ubr ubu uca ucb ucc ucd uce ucr ucu uda udb udc udd ude udr udu uea ueb uec ued uee uer ur- ura urb urc urd ure urr uru uua uuc uue uur uuu

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-