a-be aaaa aaab aaac aaae aaaf aaam aaba aabb aabc aabm aaca aacb aacc aace aacf aacm aaea aaec aaem aafa aafb aafc aaff aama aamb aamc aame abaa abab abac abae abaf abam abb- abba abbb abbe abca abcb abcc abcf abec abee abff abma abmb abmc acaa acab acac acae acba acca accc acce accf accm ace- acea acec acem acfc acfe acfm acma acmc acme acmf aeac aeaf aecb afaa afam afca afcb afcc afee affa affc afma afmc amaa amac amae amam amb- amba ambe amca amcc amec amee amfm amm- amma amme baaa baaf baam baba babb babe babm bac- baca bacc bace bafc baff bama bamb bamc bame bamf bamm bbbb bbcm bbeb bbfc bcaa bcam bcbc bcca bccc bccm bcec bcfc bcfm bcma beaf beam beba bebb bebe beca beeb beef beem befa befe beff bema beme bfca bfme bmaa bmce bmfc caaa caab caac caaf caam caba cabe cabf cac- caca cacc cace cacm caec caem cafa cafb cafc cafe caff cama camb camc came camm cbac cbbc cbca cbcc cbce cbcm cbea cbec cbee cbef cbfb cbfc cbme ccaa ccab ccac ccaf ccam ccba ccbc ccca cccb cccc cccf cccm ccee ccfa ccfc ccff ccma ccmb ccmc ccmm ceac ceba cec- ceca cece cecm ceeb ceec ceem cef- cefa cefc cema cemb ceme cemm cfaa cfab cfac cfae cfam cfbc cfca cfcb cfcf cfcm cffb cfma cfmb cmaa cmac cmba cmbc cmcc cmea cmec cmfb cmmb cmmc eaaf eaba eaca eacc eaec eafb eama eame ebac ebam ebba ebbc ebcc ebfc ecaa ecac ecam ecbc ecbe ecca eccb eccc ecce eccm ecef ecem ecfa ecfc ecma eeca eeea eeee eefa eefe efab efca effa efma emac emae emam emba embe emcc emcf emma emme faaa faac faam faba fabe fabm faca facc face faeb faem fafa fafc fafe faff fama fame fcab fcba fcca fccf feaf feam feba fece feeb feem fefc fefe feff fema femb feme femm ffcc ffee ffff fmca fmea maaa maac maaf maam maba mabe mac- maca macb macc mace maee maem mafa mafb mafc maff mama mamc mame mamf mbac mbam mbba mbca mcaa mcac mcba mcbc mcca mccc mcef mcfa mcfc mcmc mebe mec- meca mecc mece meef meem mefe meff mema memc meme mfbm mfcc mffa mmaa mmab mmac mmcc mmcm mmea mmff mmmc mmmm