a-ak aaaa aaab aaac aaam aaar aaba aabb aabc aabm aaca aacb aacc aack aacm aacr aaka aama aamb aamc aamr aara aarc aarm abaa abab abac abak abam abar abb- abba abbb abbr abca abcb abcc abcr abma abmb abmc abra abrc acaa acab acac acar acba acca accc accm acma acmc acr- acra acrc acrm acrr akaa akam akar akca akka akr- akra amaa amac amam amar amb- amba ambr amca amcc amka amm- amma amra amrc arab arac arak aram arar arba arc- arca arcm arka arma armc armm arr- arra arrc arrk arrr baaa baak baam baar baba babb babm babr bac- baca bacc back bak- baka bakr bama bamb bamc bamm bar- bara barb barc bark barm barr bbbb bbcm bbrc bcaa bcam bcar bcbc bcca bccc bccm bcma bcra bmaa brab brac brak bram brca brcb brka brkb brmc brrm brrr caaa caab caac caam caba cac- caca cacc cack cacm cacr caka cama camb camc camk camm cara carb carc cark carm carr cbac cbar cbbc cbca cbcc cbcm cbcr cbka cbkm cbkr cbrm ccaa ccab ccac ccam ccar ccba ccbc ccca cccb cccc cccm cckm ccma ccmb ccmc ccmm ccra ccrc ckac ckbc ckck ckcm ckrc ckrm cmaa cmac cmba cmbc cmcc cmmb cmmc cmra cmrr crab crac cram crar crbc crca crcc crcr crkc crmb kaaa kaab kaak kaam kaar kaba kabb kabc kabr kacb kacc kaka kakc kakk kakm kam- kama kamb kamc kamm kamr kara karb kark karm karr kbaa kbab kbac kbak kbam kbar kbba kbbb kbbc kbbk kbbm kbbr kbca kbcb kbck kbcr kbkb kbkk kbkr kbmb kbmc kbmr kbra kbrb kbrc kbrk kcaa kcab kcac kcam kcar kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kckc kckk kckm kckr kcmb kcmc kcmk kcmm kcmr kcrc kcrr kkaa kkac kkam kkar kkba kkbb kkbr kkcb kkck kkcm kkcr kkkk kkma kkmc kkmk kkmr kkrb kkrc kkrk kkrr kmac kmak kmam kmbc kmbr kmca kmcb kmcc kmcm kmcr kmkk kmmk kmmm kmmr kmrb kmrc kmrr krab krac krak kram krar krba krbb krbk krbm krbr krca krcb krcc krcm krka krkc krkk krkr krma krmb krmc krmr krrb krrc krrk krrm krrr maaa maac maak maam maar maba mac- maca macb macc mack macr maka mama mamc mar- mara marc mark marm marr mbac mbam mbba mbca mcaa mcac mcba mcbc mcca mccc mckk mcmc mcrc mkak mmaa mmab mmac mmar mmcc mmcm mmmc mmmm mmrc mr-c mrac mrbb mrbm mrca mrcb mrcc mrkr mrmc mrrc raab raak raam raba rabb rabk rac- raca racc rack raka rakk rama ramb ramm rara rarb rark rbbb rbbr rbmk rcac rcbc rccb rccc rrkm rrmc rrrr