a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aacu aaea aaec abaa abab abac abae abaj abau abb- abba abbb abbe abca abcb abcc abec abee abua abue acaa acab acac acae acba acca accc acce accu ace- acea acec acu- acue aeac aecb ajab ajac ajba ajee auaa aube auca auce auja baaa baba babb babe babu bac- baca bacc bace baja baju bau- bbau bbbb bbeb bcaa bcbc bcca bccc bcec bcuc beau beba bebb bebe beca becu beeb beej beja bjcc bjec buba bubb bube bubu buca bucc buce bucu buea bueu buja buje buju caaa caab caac caba cabe cabu cac- caca cacc cace caec caeu caja caju cauc cbac cbbc cbca cbcc cbce cbcu cbea cbec cbee ccaa ccab ccac ccba ccbc ccca cccb cccc cccu ccee ccuc ceac ceba cebu cec- ceca cece ceeb ceec ceja cejc cjbc cjca cjcb cjcj cjeu cuau cub- cuba cubb cube cuca cucc cuce cuju eaba eaca eacc eaec ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce ecua eeca eeea eeee euba eubc jaba jaca jacc jace jacu jaja jaju jbaa jcbc jccc jebb jebe jeju jjcc juab juba jube jubu juca juce jucu juja juju uabc uaca uaua ubac ubba ubbe ubja ucbc ucca ucea ucua ueba uuuu