a-ak aaaa aaab aaac aaal aaba aabb aabc aabl aabt aaca aacb aacc aack aacl aact aaka aala aalc aall aata aatc aatk aatt abaa abab abac abak abal abat abb- abba abbb abbt abca abcb abcc abcl abct abla abta ac-t acaa acab acac acat acba acbl acca accc acct acla aclc acta actc actl actt akaa akal akca akka alaa alac alak alal alat alb- alba albc alca alcc alk- alka alkb all- alla alll alta at-l at-t ataa atab atac atak atal atat atca atcc atck atcl atka atkt atla atta baaa baak baal baat baba babb bac- baca bacc back bact bak- baka bakl bakt bala balc balk ball balt bata batc batt bbbb bblb bcaa bcat bcbc bcca bccc bccl bctc blaa blab blac blak blat blbt blkb btaa btcc btcl btla bttb caaa caab caac caal caat caba cac- caca cacc cack caka cala calc calk call calt cat- cata catb catc catt cbac cbal cbat cbbc cbca cbcc cbcl cbct cbka cbkl cblb cblc cbta cbtc cbtl ccaa ccab ccac ccat ccba ccbc ccca cccb cccc cccl ccla cclc cctb cctc cctl cctt ckac ckat ckbc ckck ckcl cktb clab clat cltb cltc ctab ctal ctba ctca ctta kaaa kaab kaak kaal kaat kaba kabb kabc kacb kacc kacl kact kaka kakc kakk kakt kala kalb kalc kalk kall kalt kat- kata katb katc katk katl katt kbaa kbab kbac kbak kbal kbat kbba kbbb kbbc kbbk kbbl kbbt kbca kbcb kbck kbcl kbct kbkb kbkk kbkl kbla kblb kbll kblt kbta kbtb kbtc kbtk kbtl kbtt kcaa kcab kcac kcal kcat kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kcct kckc kckk kckl kcla kclc kclk kcll kclt kcta kctb kctc kkaa kkac kkal kkat kkba kkbb kkbl kkbt kkcb kkck kkcl kkct kkkk kklb kklc kkll kktc kktk kktl klaa klab klac klak klal klat klbb klbc klbl klbt klca klcb klcc klck klcl klka klkc klkk klkl klla kllb kllc kllk kltc kltk kltt ktaa ktak ktal ktat ktba ktbb ktbc ktbl ktbt ktcc ktck ktcl ktkb ktkc ktkk ktkt ktla ktlb ktlk ktlt kttc kttk kttt laaa laac laak laal laat laba laca lacc lack lacl lact laka lala lall lata latc latt lbcc lcac lcat lcbc lcca lccc lctl lkab lkal llat llcc lllc llll ltac ltbl ltcc lttc taa- taal taat taba tabb tabc tabl taca tacc tack tacl tact taka takk takt tala talc talk tall tata tatb tatt tbca tbcb tbcc tbta tcca tccc tctc tkac tlac ttab ttbb tttt