a-be a-ha aaaa aaab aaac aaae aaah aaba aabb aabc aabh aaca aacb aacc aace aach aaea aaec aaha abaa abab abac abae abb- abba abbb abbe abca abcb abcc abch abec abee abha acaa acab acac acae acba acca accc acce acch ace- acea acec aceh acha ache achh aeac aecb ahab ahac ahah ahha baaa baah baba babb babe bac- baca bacc bace bach baha bbbb bbch bbeb bcaa bcbc bcca bccc bcec bche beah beba bebb bebe beca bech beeb bhca bhcc caaa caab caac caah caba cabe cac- caca cacc cace cach caec caha cahe cbac cbbc cbca cbcc cbce cbea cbec cbee cbha ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ccha cche ceac ceba cec- ceca cece ceeb ceec chaa chab chac chae chah chca chce chch chea cheb chec chee cheh chha eaba eabh eaca eacc each eaec ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce echa eche eeca eeea eeee ehaa ehcc ehea eheh haab haba habe hace haec haha hcbc hcca hccb hccc hcch heah hebb hebe heca hech heeb hehe hhaa hhhh