-er a-a a-b a-c aaa aab aac aad aae aak aar ab- aba abb abc abd abe abk abr ac- aca acb acc acd ace ack acr ad- ada adb adc add ade adk adr aea aeb aec aed aee aek aer aka akb akc akd ake akk akr ar- ara arb arc ard are ark arr baa bab bac bad bae bak bar bba bbb bbc bbd bbe bbk bbr bca bcb bcc bcd bce bck bcr bda bdb bdc bdd bde bdk bdr be- bea beb bec bed bee bek ber bka bkb bkc bke bkk bkr bra brb brd bre brk brr c-- caa cab cac cad cae cak car cba cbb cbc cbd cbe cbk cbr cca ccb ccc ccd cce cck ccr cda cdb cdc cdd cde cdk cdr ce- cea ceb cec ced cee cek cer cka ckb ckc ckd cra crb crc crd cre crk crr daa dab dac dad dae dak dar dba dbb dbc dbd dbe dbk dbr dca dcb dcc dcd dce dck dcr dda ddb ddc ddd dde ddk ddr de- dea deb dec ded dee dek der dka dkb dkc dke dkk dkr dra drb drc drd dre drk drr eaa eab eac ead eae eak ear eba ebb ebc ebd ebe ebk ebr ec- eca ecb ecc ecd ece eck ecr ed- eda edb edc edd ede edk edr eea eeb eec eed eee eek eer eka ekb ekc ekd eke ekr era erb erc erd ere erk err ka- kaa kab kac kad kae kak kar kba kbb kbc kbd kbe kbk kbr kca kcb kcc kcd kce kck kcr kda kdb kdc kde kdk kdr ke- kea keb kec ked kee kek ker kkb kkc kke kkk kkr kra krc krd krk krr ra- raa rab rac rad rae rak rar rba rbb rbc rbd rbe rbk rbr rca rcb rcc rcd rce rcr rda rdb rdc rdd rde rdr re- rea reb rec red ree rek rer rkb rkc rke rkk rra rrb rrc rrd rrk rrr

a-ak a-be aaaa aaab aaac aaad aaae aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aack aacr aada aadc aade aaea aaec aaka aake aara aarc aard aare abaa abab abac abad abae abak abar abb- abba abbb abbe abbr abca abcb abcc abcd abcr abda abec abed abee aber abra abrc acaa acab acac acad acae acar acba acca accc accd acce acda acdb acdc acde ace- acea acec aced acek acer ackd acke acr- acra acrc acre acrr adaa adab adac adad adae adak adar adba adbc adcc adda addc addd adde addr adea adeb adee ader adra adre aeac aecb aede aeer aeka aer- aera aerc aerd akaa akae akar akca aked akee aker akka akr- akra akre arab arac arad arae arak arar arba arbe arc- arca arce arda ardc arde area arec ared aree arek arka arke arr- arra arrc arre arrk arrr baaa baad baak baar baba babb babe babr bac- baca bacc bace back bada badb badd bade badr baed baek baer bak- baka bake bakr bar- bara barb barc bard bare bark barr bbad bbbb bbdd bbeb bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcra bd-r bdbc bddc bead beak bear beba bebb bebe beca beck beda bede beeb beed beek beer beka beke bera berc berd bere berk berr brab brac brad brae brak brca brcb brce brda brea breb brec bred bree brek brer brka brkb brrr c-cd caaa caab caac caba cabe cac- caca cacc cace cack cacr cada cadc cadd cade cadr caec caer caka cake cara carb carc card care cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbea cbec cbee cber cbka cbkr cbrd cbre ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc ccdc ccdr cced ccee ccra ccrc ccre cd-e cd-r cdaa cdac cdad cdba cdda cddb cddr cdec cder cdre ceac cead cear ceba cec- ceca cece ceda cedd cede ceeb ceec ceke cer- cera cerc cerd cere ckac ckbc ckbe ckck cker ckrc ckrd crab crac crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree crkc daab daad daae daar daba dabb daca dace dada dade daeb daer daka dake dara darb darc dard dare dark darr dbar dbcc dcbc dcca dccb dccc dcdb dcra dcrk dddd ddrc ddre deac dead deae deak dear deba debe dec- deca decc decd dece deck deda dedd dede deeb deed deek deer dek- deka deke der- dera derb derc dere derk derr dkba dkdc draa drab drac drad drak drar drba drbc drca drda drea dred dree drek drra eaba eaca eacc eada eadb eadd eaec eara earb eard eare ebac ebba ebbc ebbr ebcc ebed eber ecaa ecac ecad ecar ecbc ecbe ecca eccb eccc ecce ecdc eced ecka ecra ecrc ecrr edac edad edar edca edda eddc edde ede- edea eder edra eeca eede eeea eeee eeka eeke eera eerc eka- ekab ekeb eked ekek eker ekka erad erba erbb erbe erca ercc erce erda erde ereb erec ered erer erke erra errc erre kaaa kaab kaak kaar kaba kabb kabc kabd kabe kabr kacb kacc kacd kace kad- kada kadd kade kadr kaer kaka kakc kake kakk kara karb kard kare kark karr kbaa kbab kbac kbad kbae kbak kbar kbba kbbb kbbc kbbd kbbe kbbk kbbr kbca kbcb kbce kbck kbcr kbdb kbde kbdr kbeb kbec kbed kbee kbek kber kbkb kbkk kbkr kbra kbrb kbrc kbrd kbre kbrk kcaa kcab kcac kcad kcar kcba kcbc kcbd kcbk kcbr kcca kccb kccc kccd kcck kccr kcda kcdc kcdd kcdr kcea kceb kcec kced kcee kckc kckk kckr kcrc kcrr kdaa kdab kdac kdad kdae kdak kdar kdbb kdbr kdca kdcc kdcd kdce kdcr kddb kddc kddd kddk kddr kdeb kdec kdka kdkb kdkd kdkk kdkr kdrb kea- kead keak kear keba kebb kebc kebe kebr keca keck kecr keda kedb kedc kedd kede kedr