a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aaco aacu aaea aaec aaoe aaoo abaa abab abac abae abau abb- abba abbb abbe abbo abca abcb abcc abec abee aboa abob aboo abou abua abue acaa acab acac acae acba acca accc acce acco accu ace- acea acec acoa acoe acou acu- acue acuo aeac aecb aoba aoca aoce aoeu auaa aube auca auce baaa baba babb babe babo babu bac- baca bacc bace baco bau- bbau bbbb bbeb bcaa bcbc bcca bccc bcec bcuc beau beba bebb bebe bebo beca becu beeb beo- boab boac boba bobb bobe bobo bobu boca boce boco bocu boea boec boee boeo boob booc booe boua boue buba bubb bube bubo bubu buca bucc buce buco bucu buea bueu c-bo caaa caab caac caba cabe cabo cabu cac- caca cacc cace caco caec caeu cauc cauo cbac cbbc cbca cbcc cbce cbcu cbea cbec cbee ccaa ccab ccac ccba ccbc ccca cccb cccc cccu ccee ccob ccoc ccuc ceac ceba cebu cec- ceca cece ceco ceeb ceec ceou coba cobb cobe cobo cobu coca coce coco cocu coob coua coub coue cuau cub- cuba cubb cube cuca cucc cuce eaba eaca eacc eaec ebac ebba ebbc ebbo ebcc eboe eboo ecaa ecac ecao ecbc ecbe ecca eccb eccc ecce ecco eco- ecou ecua eeca eeea eeee eeoc euba eubc o-eo oaau obba obbo obea obec oboe ocab ocac ocbc occa occc oce ocee oec- oeca oecc oeec ooaa ooba oobe oooo ouac oucc ouea ouu- uabc uaca uaoc uaua ubac ubba ubbe ubbo uboc ucbc ucca ucea ucua ueba uocc uuoc uuuu