a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aaco aaea aaec aaoe aaoo abaa abab abac abae abaj abb- abba abbb abbe abbo abca abcb abcc abec abee aboa abob aboo acaa acab acac acae acba acca accc acce acco ace- acea acec acoa acoe aeac aecb ajab ajac ajao ajba ajee ajob ajoo aoba aoca aoce baaa baba babb babe babo bac- baca bacc bace baco baja bbbb bbeb bcaa bcbc bcca bccc bcec beba bebb bebe bebo beca beeb beej beja beo- bjcc bjec bjoa boab boac boba bobb bobe bobo boca boce boco boea boec boee boeo bojo boob booc booe c-bo caaa caab caac caba cabe cabo cac- caca cacc cace caco caec caja cbac cbbc cbca cbcc cbce cbea cbec cbee ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ccjo ccob ccoc ceac ceba cec- ceca cece ceco ceeb ceec ceja cejc cjbc cjca cjcb cjcj cjob coba cobb cobe cobo coca coce coco cojo coob eaba eaca eacc eaec ebac ebba ebbc ebbo ebcc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco eco- eeca eeea eeee eeoc ejob ejoo jaba jabo jaca jacc jace jaco jaja jbaa jbob jcbc jccc jebb jebe jjcc joab joao joba jobe jobo joca joce joco joea joee jojo o-eo obba obbo obea obec obja oboe ocab ocac ocbc occa occc oce ocee oec- oeca oecc oeec ojea ooaa ooba oobe oooo