-er a-a a-b a-c aaa aab aac aad aae aak aar aau ab- aba abb abc abd abe abk abr abu ac- aca acb acc acd ace ack acr acu ad- ada adb adc add ade adk adr adu aea aeb aec aed aee aek aer aeu aka akb akc akd ake akk akr aku ar- ara arb arc ard are ark arr aru au- aua aub auc aud aue auk aur b-u baa bab bac bad bae bak bar bau bba bbb bbc bbd bbe bbk bbr bbu bca bcb bcc bcd bce bck bcr bcu bda bdb bdc bdd bde bdk bdr bdu be- bea beb bec bed bee bek ber beu bka bkb bkc bke bkk bkr bra brb brd bre brk brr bru bua bub buc bud bue buk bur buu c-- caa cab cac cad cae cak car cau cba cbb cbc cbd cbe cbk cbr cbu cca ccb ccc ccd cce cck ccr ccu cda cdb cdc cdd cde cdk cdr cdu ce- cea ceb cec ced cee cek cer ceu cka ckb ckc ckd cra crb crc crd cre crk crr cru cua cub cuc cud cue cuk cur cuu daa dab dac dad dae dak dar dau dba dbb dbc dbd dbe dbk dbr dbu dca dcb dcc dcd dce dck dcr dcu dda ddb ddc ddd dde ddk ddr ddu de- dea deb dec ded dee dek der deu dka dkb dkc dke dkk dkr dku dra drb drc drd dre drk drr dru dua dub duc dud due duk dur eaa eab eac ead eae eak ear eau eba ebb ebc ebd ebe ebk ebr ebu ec- eca ecb ecc ecd ece eck ecr ecu ed- eda edb edc edd ede edk edr edu eea eeb eec eed eee eek eer eka ekb ekc ekd eke ekr eku era erb erc erd ere erk err eru eu- eua eub euc eud eue eur ka- kaa kab kac kad kae kak kar kau kba kbb kbc kbd kbe kbk kbr kbu kca kcb kcc kcd kce kck kcr kcu kda kdb kdc kde kdk kdr kdu ke- kea keb kec ked kee kek ker kkb kkc kke kkk kkr kku kra krc krd krk krr kru kub kuc kud kue kuk kur kuu ra- raa rab rac rad rae rak rar rau rba rbb rbc rbd rbe rbk rbr rbu rca rcb rcc rcd rce rcr rcu rda rdb rdc rdd rde rdr rdu re- rea reb rec red ree rek rer reu rkb rkc rke rkk rku rra rrb rrc rrd rrk rrr rru rua rub ruc rud rue ruk rur ruu ua- uaa uab uac uad uae uak uar uau uba ubb ubc ube ubk ubr ubu uca ucb ucc ucd uce uck ucr ucu uda udb udc udd ude udk udr udu uea ueb uec ued uee uer uka ukb ukc uke ukk ukr uku ur- ura urb urc urd ure urk urr uru uua uuc uue uur uuu

a-ak a-be aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aack aacr aacu aada aadc aade aadu aaea aaec aaka aake aaku aara aarc aard aare aaru abaa abab abac abad abae abak abar abau abb- abba abbb abbe abbr abca abcb abcc abcd abcr abda abdu abec abed abee aber abra abrc abua abud abue abuk acaa acab acac acad acae acar acba acca accc accd acce accu acda acdb acdc acde ace- acea acec aced acek acer ackd acke acr- acra acrc acre acrr acu- acue acur adaa adab adac adad adae adak adar adba adbc adcc adda addc addd adde addr addu adea adeb adee ader adra adre adua adub adue aduk adur aeac aecb aede aeer aeka aer- aera aerc aerd akaa akae akar akca aked akee aker akeu akka akku akr- akra akre akua arab arac arad arae arak arar arau arba arbe arc- arca arce arda ardc arde ardu area arec ared aree arek areu arka arke arr- arra arrc arre arrk arrr arru arua arub arud arue auaa aube auca auce audc aude auer auke aur- aura aurd aure baaa baad baak baar baba babb babe babr babu bac- baca bacc bace back bada badb badd bade badr badu baed baek baer bak- baka bake bakr baku bar- bara barb barc bard bare bark barr baru bau- baud bauk baur bbad bbau bbbb bbdd bbeb bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcra bcru bcuc bd-r bdbc bddc bead beak bear beau beba bebb bebe beca beck becu beda bede bedu beeb beed beek beer beka beke bera berc berd bere berk berr beru beuk beur brab brac brad brae brak brau brca brcb brce brda brea breb brec bred bree brek brer brka brkb brrr bruc brud brue buad buar buba bubb bube bubu buca bucc buce buck bucu buda budb budd bude budu buea buer bueu buka buke bukk buku bur- bura burb burd bure burk burr buru c-cd caaa caab caac caba cabe cabu cac- caca cacc cace cack cacr cada cadc cadd cade cadr cadu caec caer caeu caka cake cara carb carc card care cark carr cauc cauk cbac cbar cbbc cbca cbcc cbce cbcr cbcu cbdb cbdc cbea cbec cbee cber cbka cbkr 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 ceke cer- cera cerc cerd cere ckac ckbc ckbe ckck ckdu cker ckrc ckrd crab crac crar crau crbc crbu crca crcc crce crcr crda crdc cre- crea creb crec cred cree creu crkc crub crud crue cruk cuau cub- cuba cubb cube cuca cucc cuce cuck cuda cude cued cuek cuer cuk- cuka cuke cura curb curd cure curr daab daad daae daar daau daba