-al -er a-a a-b a-c aaa aab aac aae aaf aal aar ab- aba abb abc abe abf abl abr ac- aca acb acc ace acf acl acr aea aeb aec aee aef ael aer af- afa afb afc afe aff afl afr al- ala alb alc ale alf all alr ar- ara arb arc are arf arl arr baa bab bac bae baf bal bar bba bbb bbc bbe bbf bbl bbr bca bcb bcc bce bcf bcl bcr be- bea beb bec bee bef bel ber bfa bfb bfc bfe bff bfl bfr bla blb blc ble blf bll blr bra brb bre brf brl brr c-- caa cab cac cae caf cal car cba cbb cbc cbe cbf cbl cbr cca ccb ccc cce ccf ccl ccr ce- cea ceb cec cee cef cel cer cfa cfb cfc cfe cff cfl cfr cl- cla clb clc cle clf cll clr cra crb crc cre crf crl crr eaa eab eac eae eaf eal ear eba ebb ebc ebe ebf ebl ebr ec- eca ecb ecc ece ecf ecl ecr eea eeb eec eee eef eel eer ef- efa efb efc efe eff efl efr ela elb elc ele elf ell elr era erb erc ere erf erl err faa fab fac fae faf fal far fba fbb fbc fbe fbf fbl fbr fca fcb fcc fce fcf fcl fcr fea feb fec fee fef fel fer ffa ffc ffe fff ffl ffr fla flb flc fle flf fll flr fra frb frc fre frf frl frr la- laa lab lac lae laf lal lar lba lbb lbc lbe lbf lbl lbr lca lcb lcc lce lcf lcl lcr lea leb lec lee lef lel ler lfa lfb lfc lfe lff lfl lfr lla llb llc lle llf lll llr lra lrb lrc lrf lrr ra- raa rab rac rae raf ral rar rba rbb rbc rbe rbf rbl rbr rca rcb rcc rce rcf rcl rcr re- rea reb rec ree ref rel rer rfa rfb rfc rfe rff rfl rfr rla rlc rle rlf rll rlr rra rrb rrc rrf rrl rrr

a-be aaaa aaab aaac aaae aaaf aaal aaar aaba aabb aabc aabl aaca aacb aacc aace aacf aacl aacr aaea aaec aafa aafb aafc aaff aafl aala aalc aale aall aara aarc aare abaa abab abac abae abaf 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 acel acer acfc acfe acfl acla aclc acle aclr acr- acra acrc acre acrr aeac aeaf aecb aecl aeer aela aelc aer- aera aerc afaa afar afca afcb afcc afee afel afer affa affc afla aflc afle afr- afra afrc afre alaa alac alae alal alar alb- alba albc albe alca alcc alce alea alec alee alef aler alfa alfe all- alla alle alll allr arab arac arae araf aral arar arba arbe arc- arca arce area arec aree aref arel arfa arfb arfc arff arla arle arr- arra arrc arre arrr baaa baaf baal baar baba babb babe babr bac- baca bacc bace bael baer bafc baff bala balc bale balf ball bar- bara barb barc bare barf barr bbbb bbeb bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcec bcer bcfc bcra beaf beal bear beba bebb bebe beca beeb beef beel beer befa befe beff bela bele bell bera berc bere berr bfca bffl blaa blab blac blae blea bleb blee blfc blrc brab brac brae braf brca brcb brce brea breb brec bree bref brel brer brfc brrr caaa caab caac caaf caal caba cabe cabf cac- caca cacc cace cacr caec caer cafa cafb cafc cafe caff cafl cala calc cale calf call cara carb carc care carf carl carr cbac cbal cbar cbbc cbca cbcc cbce cbcl cbcr cbea cbec cbee cbef cber cbfb cbfc 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 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 clab claf clar clea clec clee clef cler clra crab crac craf crar crbc crca crcc crce crcr cre- crea creb crec cree crfc crfl 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 ebfc ebla ecaa ecac ecal ecar ecbc ecbe ecca eccb eccc ecce eccl ecef ecfa ecfc ecfr ecla ecra ecrc ecrf ecrl ecrr eeca eeea eeee eefa eefe eefl eele eera eerc efab efbr efca effa efla el-b elab elac elal elar elba elbe elca elcb elce elea elec elee elef eler elfa elfc elfe ella elle elra eraf eral erba erbb erbe erca ercc erce ereb erec erel erer erfc erla erle erll erra errc erre faaa faac faba fabe faca facc face faeb fafa fafc fafe faff fala falc fale fall fara farb farc fare farl farr fbar fbla fble fcab fcal fcar fcba fcca fccf fcra feaf feal fear feba fece feeb feel feer fefc fefe feff fela fele felf fell fera ferb ferc fere ferr ffar ffcc ffee ffff ffrr flab flac flae flcl flea flee fler frab frac frae frbc frcc frea free frfc frla laaa laac laal laar laba labe labr laca lacc lace lacl lael laer lafb lafc lafe laff lala lale lall lara larb larc lare larf larr lbar lbcc lblr lcac lcbc lcca lccc lcce lcer lcfc lcfr lcra lcrl leaa leaf leal lear leba leca lece leea leef leel leer lefa lefe leff lela lele lell lera lerc lere lfca lfcc llcc llef lllc llll lrac lral lrba lrfc