a-be a-ha aaaa aaab aaac aaae aaah aaba aabb aabc aabh aaca aacb aacc aace aach aaco aaea aaec aaha aaoe aaoo abaa abab abac abae abb- abba abbb abbe abbo abca abcb abcc abch abec abee abha abho aboa abob aboh aboo acaa acab acac acae acba acca accc acce acch acco ace- acea acec aceh acha ache achh acho acoa acoe acoh aeac aecb ahab ahac ahah ahha ahoa ahoe aoah aoba aoca aoce baaa baah baba babb babe babo bac- baca bacc bace bach baco baha baho baoh bbbb bbch bbeb bcaa bcbc bcca bccc bcec bche beah beba bebb bebe bebo beca bech beeb beo- bhao bhca bhcc boab boac boba bobb bobe bobo boca boce boch boco boea boec boee boeo boha boho boob booc booe booh c-bo caaa caab caac caah caba cabe cabo cac- caca cacc cace cach caco caec caha cahe cbac cbbc cbca cbcc cbce cbea cbec cbee cbha ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ccha cche ccob ccoc ceac ceba cec- ceca cece ceco ceeb ceec chaa chab chac chae chah chao chca chce chch chea cheb chec chee cheh chha choc choh choo coba cobb cobe cobh cobo coca coce coch coco coha coho coob cooh eaba eabh eaca eacc each eaec ebac ebba ebbc ebbo ebcc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco echa eche echo eco- eeca eeea eeee eeoc ehaa ehcc ehea eheh haab haba habe habo hace haco haec haha haho hboc hcbc hcca hccb hccc hcch heah hebb hebe hebo heca hech heeb hehe heho hhaa hhhh hoac hoba hobe hobo hoca hoce hoch hoha hohe hoho hooe o-eo oahe obba obbo obea obec oboe ocab ocac ocbc occa occc oce ocee ocha oche oec- oeca oecc oeec ohba ohbe ohcc ohee ohho ohob ohoh ooaa ooba oobe ooha ooho oooh oooo