-al -er a-a a-b a-c aaa aab aac aae aaf aak aal aar ab- aba abb abc abe abf abk abl abr ac- aca acb acc ace acf ack acl acr aea aeb aec aee aef aek ael aer af- afa afb afc afe aff afk afl afr aka akb akc ake akk akl akr al- ala alb alc ale alf alk all alr ar- ara arb arc are arf ark arl arr baa bab bac bae baf bak bal bar bba bbb bbc bbe bbf bbk bbl bbr bca bcb bcc bce bcf bck bcl bcr be- bea beb bec bee bef bek bel ber bfa bfb bfc bfe bff bfl bfr bka bkb bkc bke bkf bkk bkl bkr bla blb blc ble blf blk bll blr bra brb bre brf brk brl brr c-- caa cab cac cae caf cak cal car cba cbb cbc cbe cbf cbk cbl cbr cca ccb ccc cce ccf cck ccl ccr ce- cea ceb cec cee cef cek cel cer cfa cfb cfc cfe cff cfk cfl cfr cka ckb ckc cl- cla clb clc cle clf clk cll clr cra crb crc cre crf crk crl crr eaa eab eac eae eaf eak eal ear eba ebb ebc ebe ebf ebk ebl ebr ec- eca ecb ecc ece ecf eck ecl ecr eea eeb eec eee eef eek eel eer ef- efa efb efc efe eff efl efr eka ekb ekc eke ekf ekl ekr ela elb elc ele elf elk ell elr era erb erc ere erf erk erl err faa fab fac fae faf fak fal far fba fbb fbc fbe fbf fbk fbl fbr fca fcb fcc fce fcf fck fcl fcr fea feb fec fee fef fek fel fer ffa ffc ffe fff ffk ffl ffr fka fkb fkc fkf fkk fkl fla flb flc fle flf fll flr fra frb frc fre frf frk frl frr ka- kaa kab kac kae kaf kak kal kar kba kbb kbc kbe kbf kbk kbl kbr kca kcb kcc kce kck kcl kcr ke- kea keb kec kee kef kek kel ker kfa kfc kff kkb kkc kke kkk kkl kkr kl- kla klb klc klf klr kra krc krf krk krl krr la- laa lab lac lae laf lak lal lar lba lbb lbc lbe lbf lbk lbl lbr lca lcb lcc lce lcf lck lcl lcr lea leb lec lee lef lek lel ler lfa lfb lfc lfe lff lfk lfl lfr lka lkb lkl lkr lla llb llc lle llf llk lll llr lra lrb lrc lrf lrk lrr ra- raa rab rac rae raf rak ral rar rba rbb rbc rbe rbf rbk rbl rbr rca rcb rcc rce rcf rcl rcr re- rea reb rec ree ref rek rel rer rfa rfb rfc rfe rff rfk rfl rfr rkb rkc rke rkf rkk rla rlc rle rlf rll rlr rra rrb rrc rrf rrk rrl rrr

a-ak a-be aaaa aaab aaac aaae aaaf aaal aaar aaba aabb aabc aabl aaca aacb aacc aace aacf aack aacl aacr aaea aaec aafa aafb aafc aaff aafl aaka aake aala aalc aale aall aara aarc aare abaa abab abac abae abaf abak abal abar abb- abba abbb abbe abbr abca abcb abcc abcf abcl abcr abec abee abel aber abff abla able abra abrc acaa acab acac acae acar acba acbl acca accc acce accf ace- acea acec acek acel acer acfc acfe acfl acke acla aclc acle aclr acr- acra acrc acre acrr aeac aeaf aecb aecl aeer aeka aela aelc aer- aera aerc afaa afak afar afca afcb afcc afee afek afel afer affa affc afka afkr afla aflc afle afr- afra afrc afre akaa akae akal akar akca akee akel aker akka akle akr- akra akre alaa alac alae alak alal alar alb- alba albc albe alca alcc alce alea alec alee alef alek aler alfa alfe alk- alka alkb alke all- alla alle alll allr arab arac arae araf arak aral arar arba arbe arc- arca arce area arec aree aref arek arel arfa arfb arfc arff arka arke arla arle arr- arra arrc arre arrk arrr baaa baaf baak baal baar baba babb babe babr bac- baca bacc bace back baek bael baer bafc baff bak- baka bake bakl bakr bala balc bale balf balk ball bar- bara barb barc bare barf bark barr bbbb bbeb bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcec bcer bcfc bcra beaf beak beal bear beba bebb bebe beca beck beeb beef beek beel beer befa befe beff beka beke bela bele belk bell bera berc bere berk berr bfca bffl blaa blab blac blae blak blea bleb blee blek blfc blkb blrc brab brac brae braf brak brca brcb brce brea breb brec bree bref brek brel brer brfc brka brkb brrr caaa caab caac caaf caal caba cabe cabf cac- caca cacc cace cack cacr caec caer cafa cafb cafc cafe caff cafl caka cake cala calc cale calf calk call cara carb carc care carf cark carl carr cbac cbal cbar cbbc cbca cbcc cbce cbcl cbcr cbea cbec cbee cbef cber cbfb cbfc cbka cbkl cbkr cblb cblc cbre cbrl ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf cccl ccee ccel ccfa ccfc ccff ccfl ccla cclc ccra ccrc ccre ccrf ccrl ceac ceal cear ceba cec- ceca cece ceeb ceec ceel cef- cefa cefc ceke cel- cela celc cele celf cell cer- cera cerc cere cerf cerl cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cfcl cffb cffr cfra cfrb cfre ckac ckbc ckbe ckck ckcl cker ckfr cklf ckrc clab claf clar clea clec clee clef clek cler clra crab crac craf crar crbc crca crcc crce crcr cre- crea creb crec cree crfc crfl crkc crkl crlf e-cl e-la eaaf eaba eaca eacc eaec eafb eala ealc eale eara earb eare earl ebac ebal ebba ebbc ebbr ebcc ebel eber