a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aaco aaea aaec aage aaoe aaoo abaa abab abac abae abag abb- abba abbb abbe abbo abca abcb abcc abec abee aboa abob aboo acaa acab acac acae acag acba acca accc acce acco ace- acea acec acga acoa acoe acog aeac aecb aega ag-o agac agag agao agba agbo agca agcc agce agco agea agee agga agge agob agog agoo aoba aoca aoce baaa baba babb babe babo bac- baca bacc bace baco baga bage bagg bago bbbb bbeb bbga bcaa bcbc bcbg bcca bccc bcec beag beba bebb bebe bebo beca beeb beeg bega begg bego beo- bgca boab boac boag boba bobb bobe bobo boca boce boco boea boec boee boeo boga boge bogg bogo boob booc booe boog c-bo caaa caab caac caba cabe cabg cabo cac- caca cacc cace caco caec caga cage cagg cago cbac cbbc cbca cbcc cbce cbea cbec cbee cbga cbgb ccaa ccab ccac ccag ccba ccbc ccca cccb cccc ccee ccga ccgc ccob ccoc ceac ceba cec- ceca cece ceco ceeb ceec cege cego cgac cgcc cgcg coag coba cobb cobe cobo coca coce coco cogo coob eaba eaca eacc eaec eaga eage ebac ebba ebbc ebbo ebcc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco eco- ecog eeca eeea eeee eega eeoc egaa egae egao egba egbe egcc egcg egea egec egee eggb egge eggo ego- gaba gabb gabe gabo gace gaea gaec gaga gage gagg gago gbag gbbo gc-c gcaa gcbc gccc gcoa geab geba gebe geca gece gege gegg gego geo- geog gggg goba gobe gobo goca goce goga gogo goog o-eo obba obbo obea obec oboe ocab ocac ocbc occa occc oce ocee ocga oec- oeca oecc oeec oegb ogae ogb ogba ogbe ogea ogee ogge ogoa ogog ooaa ooba oobe oooo