a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aaea aaec aage abaa abab abac abae abag abb- abba abbb abbe abca abcb abcc abec abee acaa acab acac acae acag acba acca accc acce ace- acea acec acga aeac aecb aega agac agag agba agca agcc agce agea agee agga agge baaa baba babb babe bac- baca bacc bace baga bage bagg bbbb bbeb bbga bcaa bcbc bcbg bcca bccc bcec beag beba bebb bebe beca beeb beeg bega begg bgca caaa caab caac caba cabe cabg cac- caca cacc cace caec caga cage cagg cbac cbbc cbca cbcc cbce cbea cbec cbee cbga cbgb ccaa ccab ccac ccag ccba ccbc ccca cccb cccc ccee ccga ccgc ceac ceba cec- ceca cece ceeb ceec cege cgac cgcc cgcg eaba eaca eacc eaec eaga eage ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce eeca eeea eeee eega egaa egae egba egbe egcc egcg egea egec egee eggb egge gaba gabb gabe gace gaea gaec gaga gage gagg gbag gc-c gcaa gcbc gccc geab geba gebe geca gece gege gegg gggg