a-be aaaa aaab aaac aaae aaam aaba aabb aabc aabm aaca aacb aacc aace aacm aacu aaea aaec aaem aama aamb aamc aame abaa abab abac abae abam abau abb- abba abbb abbe abca abcb abcc abec abee abma abmb abmc abua abue abum acaa acab acac acae acba acca accc acce accm accu ace- acea acec acem acma acmc acme acmu acu- acue acum aeac aecb amaa amac amae amam amb- amba ambe ambu amca amcc amec amee ameu amm- amma amme ammu amua amum auaa aube auca auce auma baaa baam baba babb babe babm babu bac- baca bacc bace bama bamb bamc bame bamm bamu bau- baum bbau bbbb bbcm bbeb bcaa bcam bcbc bcca bccc bccm bcec bcma bcuc beam beau beba bebb bebe beca becu beeb beem bema beme bemu bmaa bmce buba bubb bube bubu buca bucc buce bucu buea buem bueu bum- buma bumb caaa caab caac caam caba cabe cabu cac- caca cacc cace cacm caec caem caeu cama camb camc came camm cauc caum cbac cbbc cbca cbcc cbce cbcm cbcu cbea cbec cbee cbme ccaa ccab ccac ccam ccba ccbc ccca cccb cccc cccm cccu ccee ccma ccmb ccmc ccmm ccuc ceac ceba cebu cec- ceca cece cecm ceeb ceec ceem cema cemb ceme cemm cemu cmaa cmac cmba cmbc cmcc cmea cmec cmmb cmmc cuau cub- cuba cubb cube cuca cucc cuce cucm cum- cuma cume eaba eaca eacc eaec eama eame ebac ebam ebba ebbc ebcc ecaa ecac ecam ecbc ecbe ecca eccb eccc ecce eccm ecem ecma ecua eeca eeea eeee emac emae emam emba embe emcc emeu emma emme emmu euba eubc eumc maaa maac maam maba mabe mabu mac- maca macb macc mace macu maee maem mama mamc mame mamu maua maum mbac mbam mbba mbca mcaa mcac mcba mcbc mcca mccc mcmc mebe mec- meca mecc mece meem mema memc meme memu meum mmaa mmab mmac mmcc mmcm mmea mmmc mmmm muac mube muc- mucc muce mucu muee muma mume mumm mumu uabc uaca uamc uaua ubac ubba ubbe ucam ucbc ucca ucea ucmc ucua ueba umaa umac umb- umba umbe umec umma uuuu