a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aaco aaea aaec aaoe aaoo abaa abab abac abae abb- abba abbb abbe abbo abca abcb abcc abec abee aboa abob aboo acaa acab acac acae acba acca accc acce acco ace- acea acec acoa acoe aeac aecb aoba aoca aoce baaa baba babb babe babo bac- baca bacc bace baco bbbb bbeb bcaa bcbc bcca bccc bcec beba bebb bebe bebo beca beeb beo- boab boac boba bobb bobe bobo boca boce boco boea boec boee boeo boob booc booe c-bo caaa caab caac caba cabe cabo cac- caca cacc cace caco caec cbac cbbc cbca cbcc cbce cbea cbec cbee ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ccob ccoc ceac ceba cec- ceca cece ceco ceeb ceec coba cobb cobe cobo coca coce coco coob eaba eaca eacc eaec ebac ebba ebbc ebbo ebcc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco eco- eeca eeea eeee eeoc o-eo obba obbo obea obec oboe ocab ocac ocbc occa occc oce ocee oec- oeca oecc oeec ooaa ooba oobe oooo