-al a-a a-b a-c aaa aab aac aae aaf aak aal ab- aba abb abc abe abf abk abl ac- aca acb acc ace acf ack acl aea aeb aec aee aef aek ael af- afa afb afc afe aff afk afl aka akb akc ake akk akl al- ala alb alc ale alf alk all baa bab bac bae baf bak bal bba bbb bbc bbe bbf bbk bbl bca bcb bcc bce bcf bck bcl be- bea beb bec bee bef bek bel bfa bfb bfc bfe bff bfl bka bkb bkc bke bkf bkk bkl bla blb blc ble blf blk bll c-- caa cab cac cae caf cak cal cba cbb cbc cbe cbf cbk cbl cca ccb ccc cce ccf cck ccl ce- cea ceb cec cee cef cek cel cfa cfb cfc cfe cff cfk cfl cka ckb ckc cl- cla clb clc cle clf clk cll eaa eab eac eae eaf eak eal eba ebb ebc ebe ebf ebk ebl ec- eca ecb ecc ece ecf eck ecl eea eeb eec eee eef eek eel ef- efa efb efc efe eff efl eka ekb ekc eke ekf ekl ela elb elc ele elf elk ell faa fab fac fae faf fak fal fba fbb fbc fbe fbf fbk fbl fca fcb fcc fce fcf fck fcl fea feb fec fee fef fek fel ffa ffc ffe fff ffk ffl fka fkb fkc fkf fkk fkl fla flb flc fle flf fll ka- kaa kab kac kae kaf kak kal kba kbb kbc kbe kbf kbk kbl kca kcb kcc kce kck kcl ke- kea keb kec kee kef kek kel kfa kfc kff kkb kkc kke kkk kkl kl- kla klb klc klf la- laa lab lac lae laf lak lal lba lbb lbc lbe lbf lbk lbl lca lcb lcc lce lcf lck lcl lea leb lec lee lef lek lel lfa lfb lfc lfe lff lfk lfl lka lkb lkl lla llb llc lle llf llk lll

a-ak a-be aaaa aaab aaac aaae aaaf aaal aaba aabb aabc aabl aaca aacb aacc aace aacf aack aacl aaea aaec aafa aafb aafc aaff aafl aaka aake aala aalc aale aall abaa abab abac abae abaf abak abal abb- abba abbb abbe abca abcb abcc abcf abcl abec abee abel abff abla able acaa acab acac acae acba acbl acca accc acce accf ace- acea acec acek acel acfc acfe acfl acke acla aclc acle aeac aeaf aecb aecl aeka aela aelc afaa afak afca afcb afcc afee afek afel affa affc afka afla aflc afle akaa akae akal akca akee akel akka akle alaa alac alae alak alal alb- alba albc albe alca alcc alce alea alec alee alef alek alfa alfe alk- alka alkb alke all- alla alle alll baaa baaf baak baal baba babb babe bac- baca bacc bace back baek bael bafc baff bak- baka bake bakl bala balc bale balf balk ball bbbb bbeb bbfc bblb bcaa bcbc bcca bccc bccl bcec bcfc beaf beak beal beba bebb bebe beca beck beeb beef beek beel befa befe beff beka beke bela bele belk bell bfca bffl blaa blab blac blae blak blea bleb blee blek blfc blkb caaa caab caac caaf caal caba cabe cabf cac- caca cacc cace cack caec cafa cafb cafc cafe caff cafl caka cake cala calc cale calf calk call cbac cbal cbbc cbca cbcc cbce cbcl cbea cbec cbee cbef cbfb cbfc cbka cbkl cblb cblc ccaa ccab ccac ccaf ccba ccbc ccca cccb cccc cccf cccl ccee ccel ccfa ccfc ccff ccfl ccla cclc ceac ceal ceba cec- ceca cece ceeb ceec ceel cef- cefa cefc ceke cel- cela celc cele celf cell cfaa cfab cfac cfae cfbc cfca cfcb cfcf cfcl cffb ckac ckbc ckbe ckck ckcl cklf clab claf clea clec clee clef clek e-cl e-la eaaf eaba eaca eacc eaec eafb eala ealc eale ebac ebal ebba ebbc ebcc ebel ebfc ebla ecaa ecac ecal ecbc ecbe ecca eccb eccc ecce eccl ecef ecfa ecfc ecka ecla eeca eeea eeee eefa eefe eefl eeka eeke eele efab efca effa efke efla eka- ekab ekeb ekek ekfc ekka el-b elab elac elal elba elbe elca elcb elce elea elec elee elef elek elfa elfc elfe elka elke ella elle f--k faaa faac faba fabe faca facc face fack faeb fafa fafc fafe faff fake fala falc fale falk fall fbla fble fcab fcal fcba fcca fccf feaf feak feal feba fece feck feeb feek feel fefc fefe feff feke fela fele felf felk fell ffcc ffee ffff fkab flab flac flae flak flcl flea flee kaaa kaab kaaf kaak kaal kaba kabb kabc kabe kabf kacb kacc kace kacl kael kafa kafc kafe kaff kaka kakc kake kakk kala kalb kalc kale kalf kalk kall kbaa kbab kbac kbae kbak kbal kbba kbbb kbbc kbbe kbbf kbbk kbbl kbca kbcb kbce kbck kbcl kbeb kbec kbee kbef kbek kbel kbfb kbfc kbff kbfk kbfl kbkb kbkf kbkk kbkl kbla kblb kble kblf kbll kcaa kcab kcac kcal kcba kcbc kcbf kcbk kcbl kcca kccb kccc kcck kccl kcea kceb kcec kcee kcel kcfa kcfb kcfc kcfl kckc kckf kckk kckl kcla kclc kcle kclf kclk kcll kea- keak keal keba kebb kebc kebe keca keck keef keek keel kefa kefb kefc keff keka kekb kekc keke kekl kela kele kelf kelk kell kfab kfac kfal kfbc kfbk kfcf kfeb kfel kffa kffb kfff kffk kfka kfkb kfla kflb kflc kflf kfll kkaa kkac kkal kkba kkbb kkbe kkbl kkcb kkck kkcl kkea kkkk kklb kklc kklf kkll klaa klab klac klaf klak klal klbb klbc klbe klbf klbl klca klcb klcc klce klck klcl klea kleb klec klee klef klek klfa klfc klfe klff klka klkc klkk klkl klla kllb kllc klle kllk laaa laac laak laal laba labe laca lacc lace lack lacl lael lafb lafc lafe laff laka lake lala lale lall lbcc lcac lcbc lcca lccc