a-ak aaaa aaab aaac aaam aaba aabb aabc aabm aaca aacb aacc aack aacm aaka aama aamb aamc abaa abab abac abak abam abb- abba abbb abca abcb abcc abma abmb abmc acaa acab acac acba acca accc accm acma acmc akaa akam akca akka amaa amac amam amb- amba amca amcc amka amm- amma baaa baak baam baba babb babm bac- baca bacc back bak- baka bama bamb bamc bamm bbbb bbcm bcaa bcam bcbc bcca bccc bccm bcma bmaa caaa caab caac caam caba cac- caca cacc cack cacm caka cama camb camc camk camm cbac cbbc cbca cbcc cbcm cbka cbkm ccaa ccab ccac ccam ccba ccbc ccca cccb cccc cccm cckm ccma ccmb ccmc ccmm ckac ckbc ckck ckcm cmaa cmac cmba cmbc cmcc cmmb cmmc kaaa kaab kaak kaam kaba kabb kabc kacb kacc kaka kakc kakk kakm kam- kama kamb kamc kamm kbaa kbab kbac kbak kbam kbba kbbb kbbc kbbk kbbm kbca kbcb kbck kbkb kbkk kbmb kbmc kcaa kcab kcac kcam kcba kcbc kcbk kcca kccb kccc kcck kckc kckk kckm kcmb kcmc kcmk kcmm kkaa kkac kkam kkba kkbb kkcb kkck kkcm kkkk kkma kkmc kkmk kmac kmak kmam kmbc kmca kmcb kmcc kmcm kmkk kmmk kmmm maaa maac maak maam maba mac- maca macb macc mack maka mama mamc mbac mbam mbba mbca mcaa mcac mcba mcbc mcca mccc mckk mcmc mkak mmaa mmab mmac mmcc mmcm mmmc mmmm