a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aaea aaec abaa abab abac abae abb- abba abbb abbe abca abcb abcc abec abee acaa acab acac acae acba acca accc acce ace- acea acec aeac aecb baaa baba babb babe bac- baca bacc bbbb bbeb bcaa bcbc bcca bccc bcec beba bebb bebe beca beeb caaa caab caac caba cabe cac- caca cacc cace caec cbac cbbc cbca cbcc cbce cbea cbec cbee ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ceac ceba cec- ceca cece ceeb ceec eaba eaca eacc eaec ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce eeca eeea eeee