a-ak a-be aaaa aaab aaac aaae aaal aaba aabb aabc aabl aaca aacb aacc aace aack aacl aaea aaec aaka aake aala aalc aale aall abaa abab abac abae abak abal abb- abba abbb abbe abca abcb abcc abcl abec abee abel abla able acaa acab acac acae acba acbl acca accc acce ace- acea acec acek acel acke acla aclc acle aeac aecb aecl aeka aela aelc akaa akae akal akca akee akel akka akle alaa alac alae alak alal alb- alba albc albe alca alcc alce alea alec alee alek alk- alka alkb alke all- alla alle alll baaa baak baal baba babb babe bac- baca bacc bace back baek bael bak- baka bake bakl bala balc bale balk ball bbbb bbeb bblb bcaa bcbc bcca bccc bccl bcec beak beal beba bebb bebe beca beck beeb beek beel beka beke bela bele belk bell blaa blab blac blae blak blea bleb blee blek blkb caaa caab caac caal caba cabe cac- caca cacc cace cack caec caka cake cala calc cale calk call cbac cbal cbbc cbca cbcc cbce cbcl cbea cbec cbee cbka cbkl cblb cblc ccaa ccab ccac ccba ccbc ccca cccb cccc cccl ccee ccel ccla cclc ceac ceal ceba cec- ceca cece ceeb ceec ceel ceke cel- cela celc cele cell ckac ckbc ckbe ckck ckcl clab clea clec clee clek e-cl e-la eaba eaca eacc eaec eala ealc eale ebac ebal ebba ebbc ebcc ebel ebla ecaa ecac ecal ecbc ecbe ecca eccb eccc ecce eccl ecka ecla eeca eeea eeee eeka eeke eele eka- ekab ekeb ekek ekka el-b elab elac elal elba elbe elca elcb elce elea elec elee elek elka elke ella elle kaaa kaab kaak kaal kaba kabb kabc kabe kacb kacc kace kacl kael kaka kakc kake kakk kala kalb kalc kale kalk kall kbaa kbab kbac kbae kbak kbal kbba kbbb kbbc kbbe kbbk kbbl kbca kbcb kbce kbck kbcl kbeb kbec kbee kbek kbel kbkb kbkk kbkl kbla kblb kble kbll kcaa kcab kcac kcal kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kcea kceb kcec kcee kcel kckc kckk kckl kcla kclc kcle kclk kcll kea- keak keal keba kebb kebc kebe keca keck keek keel keka kekb kekc keke kekl kela kele kelk kell kkaa kkac kkal kkba kkbb kkbe kkbl kkcb kkck kkcl kkea kkkk kklb kklc kkll klaa klab klac klak klal klbb klbc klbe klbl klca klcb klcc klce klck klcl klea kleb klec klee klek klka klkc klkk klkl klla kllb kllc klle kllk laaa laac laak laal laba labe laca lacc lace lack lacl lael laka lake lala lale lall lbcc lcac lcbc lcca lccc lcce leaa leak leal leba leca lece leck leea leek leel leka leke lekk lela lele lell lkab lkal llcc lllc llll