-er a-a a-b a-c aaa aab aac aad aae aaf aak aar ab- aba abb abc abd abe abf abk abr ac- aca acb acc acd ace acf ack acr ad- ada adb adc add ade adf adk adr aea aeb aec aed aee aef aek aer af- afa afb afc afd afe aff afk afr aka akb akc akd ake akk akr ar- ara arb arc ard are arf ark arr baa bab bac bad bae baf bak bar bba bbb bbc bbd bbe bbf bbk bbr bca bcb bcc bcd bce bcf bck bcr bda bdb bdc bdd bde bdf bdk bdr be- bea beb bec bed bee bef bek ber bfa bfb bfc bfd bfe bff bfr bka bkb bkc bke bkf bkk bkr bra brb brd bre brf brk brr c-- caa cab cac cad cae caf cak car cba cbb cbc cbd cbe cbf cbk cbr cca ccb ccc ccd cce ccf cck ccr cda cdb cdc cdd cde cdf cdk cdr ce- cea ceb cec ced cee cef cek cer cfa cfb cfc cfd cfe cff cfk cfr cka ckb ckc ckd cra crb crc crd cre crf crk crr daa dab dac dad dae daf dak dar dba dbb dbc dbd dbe dbf dbk dbr dca dcb dcc dcd dce dcf dck dcr dda ddb ddc ddd dde ddf ddk ddr de- dea deb dec ded dee def dek der dfa dfb dfc dfd dfe dff dfk dfr dka dkb dkc dke dkk dkr dra drb drc drd dre drk drr eaa eab eac ead eae eaf eak ear eba ebb ebc ebd ebe ebf ebk ebr ec- eca ecb ecc ecd ece ecf eck ecr ed- eda edb edc edd ede edf edk edr eea eeb eec eed eee eef eek eer ef- efa efb efc efd efe eff efr eka ekb ekc ekd eke ekf ekr era erb erc erd ere erf erk err faa fab fac fad fae faf fak far fba fbb fbc fbd fbe fbf fbk fbr fca fcb fcc fcd fce fcf fck fcr fda fdb fdc fdd fde fdf fdk fdr fea feb fec fed fee fef fek fer ffa ffc ffd ffe fff ffk ffr fka fkb fkc fkf fkk fra frb frc frd fre frf frk frr ka- kaa kab kac kad kae kaf kak kar kba kbb kbc kbd kbe kbf kbk kbr kca kcb kcc kcd kce kck kcr kda kdb kdc kde kdf kdk kdr ke- kea keb kec ked kee kef kek ker kfa kfc kfd kff kkb kkc kke kkk kkr kra krc krd krf krk krr ra- raa rab rac rad rae raf rak rar rba rbb rbc rbd rbe rbf rbk rbr rca rcb rcc rcd rce rcf rcr rda rdb rdc rdd rde rdf rdr re- rea reb rec red ree ref rek rer rfa rfb rfc rfd rfe rff rfk rfr rkb rkc rke rkf rkk rra rrb rrc rrd rrf rrk rrr

a-ak a-be aaaa aaab aaac aaad aaae aaaf aaar aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aack aacr aada aadc aade aaea aaec aafa aafb aafc aafd aaff aaka aake aara aarc aard aare abaa abab abac abad abae abaf abak abar abb- abba abbb abbe abbr abca abcb abcc abcd abcf abcr abda abec abed abee aber abff abra abrc acaa acab acac acad acae acar acba acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acek acer acfc acfd acfe 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 adfa adfc adra adre aeac aeaf aecb aede aeer aeka aer- aera aerc aerd afaa afad afak afar afca afcb afcc afdb afdc afee afek afer affa affc afka afkr afr- afra afrc afre akaa akae akar akca aked akee aker akka akr- akra akre arab arac arad arae araf arak arar arba arbe arc- arca arce arda ardc arde ardf area arec ared aree aref arek arfa arfb arfc arff arka arke arr- arra arrc arre arrk arrr baaa baad baaf baak baar baba babb babe babr bac- baca bacc bace back bada badb badd bade badr baed baek baer bafc baff bak- baka bake bakr bar- bara barb barc bard bare barf bark barr bbad bbbb bbdd bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcda bcde bcec bcer bcfc bcra bd-r bdbc bddc bead beaf beak bear beba bebb bebe beca beck beda bede beeb beed beef beek beer befa befe beff beka beke bera berc berd bere berk berr bfca brab brac brad brae braf brak brca brcb brce brda brea breb brec bred bree bref brek brer brfc brka brkb brrr c-cd caaa caab caac caaf caba cabe cabf cac- caca cacc cace cack cacr cada cadc cadd cade cadr caec caer cafa cafb cafc cafe caff caka cake cara carb carc card care carf cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbdb cbdc cbea cbec cbee cbef cber cbfb cbfc cbka cbkr cbrd cbre ccaa ccab ccac ccad ccaf ccar ccba ccbc ccca cccb cccc cccf ccdc ccdf ccdr cced ccee ccfa ccfc ccfd ccff ccra ccrc ccre ccrf cd-e cd-r cdaa cdac cdad cdba cdbf cdda cddb cddr cdec cdef cder cdfa cdfe cdre ceac cead cear ceba cec- ceca cece ceda cedd cede ceeb ceec cef- cefa cefc ceke cer- cera cerc cerd cere cerf cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cfda cffb cffr cfra cfrb cfre ckac ckbc ckbe ckck cker ckfr ckrc ckrd crab crac craf crar crbc crca crcc crce crcr crda crdc cre- crea creb crec cred cree crfc crkc daab daad daae daar daba dabb daca dace dada dade daeb daer dafa dafc dafe daff daka dake dara darb darc dard dare darf dark darr dbar dbcc dbfc dcbc dcca dccb dccc dcdb dcfc dcra dcrk dddd