a-ak aaaa aaab aaac aaal aaam aaba aabb aabc aabl aabm aaca aacb aacc aack aacl aacm aaka aala aalc aall aama aamb aamc abaa abab abac abak abal abam abb- abba abbb abca abcb abcc abcl abla abma abmb abmc acaa acab acac acba acbl acca accc accm acla aclc acma acmc akaa akal akam akca akka alaa alac alak alal alam alb- alba albc albm alca alcc alk- alka alkb all- alla alll alma almc amaa amac amal amam amb- amba amca amcc amka amla amm- amma baaa baak baal baam baba babb babm bac- baca bacc back bak- baka bakl bala balc balk ball balm bama bamb bamc baml bamm bbbb bbcm bblb bcaa bcam bcbc bcca bccc bccl bccm bcma blaa blab blac blak blam blkb bmaa caaa caab caac caal caam caba cac- caca cacc cack cacm caka cala calc calk call calm cama camb camc camk caml camm cbac cbal cbbc cbca cbcc cbcl cbcm cbka cbkl cbkm cblb cblc ccaa ccab ccac ccam ccba ccbc ccca cccb cccc cccl cccm cckm ccla cclc cclm ccma ccmb ccmc ccmm ckac ckbc ckck ckcl ckcm cklm ckml clab clam cmaa cmac cmba cmbc cmcc cmla cmll cmmb cmmc cmml kaaa kaab kaak kaal kaam kaba kabb kabc kacb kacc kacl kaka kakc kakk kakm kala kalb kalc kalk kall kalm kam- kama kamb kamc kaml kamm kbaa kbab kbac kbak kbal kbam kbba kbbb kbbc kbbk kbbl kbbm kbca kbcb kbck kbcl kbkb kbkk kbkl kbla kblb kbll kblm kbmb kbmc kcaa kcab kcac kcal kcam kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kckc kckk kckl kckm kcla kclc kclk kcll kclm kcmb kcmc kcmk kcml kcmm kkaa kkac kkal kkam kkba kkbb kkbl kkcb kkck kkcl kkcm kkkk kklb kklc kkll kkma kkmc kkmk kkml klaa klab klac klak klal klam klbb klbc klbl klbm klca klcb klcc klck klcl klcm klka klkc klkk klkl klla kllb kllc kllk klmk klmm kmac kmak kmal kmam kmbc kmbl kmca kmcb kmcc kmcl kmcm kmkk kmkl kmla kmlb kmlk kmmk kmml kmmm laaa laac laak laal laam laba laca lacc lack lacl laka lala lall lalm lama lamb lamk lamm lbcc lbmc lcac lcbc lcca lccc lccm lkab lkal llcc lllc llll lmcc maaa maac maak maal maam maba mac- maca macb macc mack maka mal- mala malk mall malm mama mamc mbac mbam mbba mbca mcaa mcac mcba mcbc mcca mccc mccl mckk mcla mcmc mcml mkak mlab mlak mlba mlcc mmaa mmab mmac mmcc mmcl mmcm mmmc mmmm