a-be a-ha aaaa aaab aaac aaae aaah aaba aabb aabc aabh aaca aacb aacc aace aach aaea aaec aage aagh aaha abaa abab abac abae abag abb- abba abbb abbe abca abcb abcc abch abec abee abha acaa acab acac acae acag acba acca accc acce acch ace- acea acec aceh acga acha ache achh aeac aecb aega agac agag agba agca agcc agce agea agee agga agge agha aghe ahab ahac ahah ahha baaa baah baba babb babe bac- baca bacc bace bach baga bage bagg bagh baha bbbb bbch bbeb bbga bcaa bcbc bcbg bcca bccc bcec bche beag beah beba bebb bebe beca bech beeb beeg bega begg bgca bhag bhca bhcc caaa caab caac caah caba cabe cabg cac- caca cacc cace cach caec caga cage cagg caha cahe cbac cbbc cbca cbcc cbce cbea cbec cbee cbga cbgb cbha ccaa ccab ccac ccag ccba ccbc ccca cccb cccc ccee ccga ccgc ccha cche ceac ceba cec- ceca cece ceeb ceec cege cgac cgcc cgcg chaa chab chac chae chag chah chca chce chch chea cheb chec chee cheh chgb chge chha eaba eabh eaca eacc each eaec eaga eage ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce echa eche eeca eeea eeee eega egaa egae egba egbe egcc egcg egea egec egee eggb egge eggh eghe eghh ehaa ehcc ehea eheh gaba gabb gabe gace gach gaea gaec gaga gage gagg gaha gahe gbag gc-c gcaa gcbc gccc geab geba gebe geca gece gege gegg geha gggg gghg ghea ghee gheg haab haag haba habe hace haec hag- haga hage hagg hagh haha hbag hcbc hcca hccb hccc hcch hcgh heah hebb hebe heca hech heeb heeg hega hege hegg hegh hehe hgah hggc hhaa hhgg hhhh