a-be a-do aaaa aaab aaac aaad aaae aaba aabb aabc aabd aaca aacb aacc aacd aace aaco aada aadc aade aaea aaec aaoe aaoo abaa abab abac abad abae abb- abba abbb abbe abbo abca abcb abcc abcd abda abdo abec abed abee aboa abob abod aboo acaa acab acac acad acae acba acca accc accd acce acco acda acdb acdc acde ace- acea acec aced acoa acod acoe adaa adab adac adad adae adao adba adbc adcc adda addc addd adde addo adea adeb adee adeo adob adoc adod adoe adoo aeac aecb aede aoba aoca aoce baaa baad baba babb babe babo bac- baca bacc bace baco bada badb badd bade bado baed bbad bbbb bbdd bbdo bbeb bcaa bcbc bcca bccc bcda bcde bcec bdbc bddc bead beba bebb bebe bebo beca beda bede bedo beeb beed beo- beod boab boac boad boba bobb bobe bobo boca boce boco boda bodb bode bodo boea boec boee boeo boob booc bood booe c-bo c-cd caaa caab caac caba cabe cabo cac- caca cacc cace caco cada cadc cadd cade cado caec caod cbac cbbc cbca cbcc cbce cbdb cbdc cbdo cbea cbec cbee ccaa ccab ccac ccad ccba ccbc ccca cccb cccc ccdc cced ccee ccob ccoc ccod cd-e cdaa cdac cdad cdba cdda cddb cdec ceac cead ceba cec- ceca cece ceco ceda cedd cede cedo ceeb ceec coad coba cobb cobe cobo coca coce coco coda codd code coed coob cood d-bo daab daad daae daba dabb dabo daca dace dada dade dado daeb dbcc dcbc dcca dccb dccc dcdb dddd ddoc deac dead deae deba debe dec- deca decc decd dece deco deda dedd dede dedo deeb deed doab doae doba dobb dobe doca doce doco dod- doda dodd dode dodo doea doob dood eaba eaca eacc eada eadb eadd eaec ebac ebba ebbc ebbo ebcc ebed eboe eboo ecaa ecac ecad ecao ecbc ecbe ecca eccb eccc ecce ecco ecdc eced eco- ecod edac edad edca edda eddc edde eddo ede- edea edoc edod eeca eede eeea eeee eeoc eocd eode o-eo oade obad obba obbo obea obec obed oboe ocab ocac ocad ocbc occa occc oce oced ocee odac odbo odda oddd odea oded odeo odoo oec- oeca oecc oedo oeec ooaa ooba oobe ooda oooo