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 abax 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 ahex ahha axce ba-x 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 caex caha cahe caxa cbac cbax cbbc cbca cbcc cbce cbea cbec cbee cbha cbxa ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ccha cche ceac ceba cec- ceca cece ceeb ceec cexe chaa chab chac chae chah chax chca chce chch chea cheb chec chee cheh chex chha cxxx 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 exa- exch exec exh- haab haba habe hace haec haha haxe hcbc hcca hccb hccc hcch heah hebb hebe heca hech heeb hehe hex- hexa hexb hexe hhaa hhex hhhh xace xbee xexe xxxx