a-ak aaaa aaab aaac aaal aaba aabb aabc aabl aaca aacb aacc aack aacl aaka aala aalc aall abaa abab abac abak abal abb- abba abbb abca abcb abcc abcl abla abza acaa acab acac acba acbl acca accc acla aclc akaa akal akca akka alaa alac alak alal alaz alb- alba albc alca alcc alk- alka alkb all- alla alll alza aza- azab azal azaz azca azlk azza baaa baak baal baaz baba babb bac- baca bacc back bacz bak- baka bakl bala balc balk ball baza bbbb bblb bcaa bcbc bcca bccc bccl blaa blab blac blak blaz blkb bzzz caaa caab caac caal caba cac- caca cacc cack caka cala calc calk call caza cbac cbal cbbc cbca cbcc cbcl cbka cbkl cblb cblc ccaa ccab ccac ccba ccbc ccca cccb cccc cccl ccla cclc ckac ckbc ckck ckcl clab kaaa kaab kaak kaal kaba kabb kabc kabz kacb kacc kacl kacz kaka kakc kakk kala kalb kalc kalk kall kalz kaza kazc kazz kbaa kbab kbac kbak kbal kbaz kbba kbbb kbbc kbbk kbbl kbbz kbca kbcb kbck kbcl kbcz kbkb kbkk kbkl kbkz kbla kblb kbll kblz kbzc kbzz kcaa kcab kcac kcal kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kckc kckk kckl kckz kcla kclc kclk kcll kclz kczz kkaa kkac kkal kkba kkbb kkbl kkbz kkcb kkck kkcl kkkk kklb kklc kkll kklz kkzz klaa klab klac klak klal klaz klbb klbc klbl klca klcb klcc klck klcl klcz klka klkc klkk klkl klla kllb kllc kllk klza klzk klzz kzal kzaz kzbb kzbk kzbl kzbz kzcl kzkz kzla kzlb kzlk kzlz kzza kzzb kzzk kzzz laaa laac laak laal laba laca lacc lack lacl laka lala lall laza lbcc lcac lcbc lcca lccc lkab lkal llcc lllc llll zaal zaba zaca zack zaka zakk zal zala zalk zaza zzzz