a-be a-do aaaa aaab aaad aaae aaav aaba aabb aabd aada aade aaea aaev aaoe aaoo aava abaa abab abad abae abb- abba abbb abbe abbo abda abdo abed abee aboa abob abod aboo abov abva abvd adaa adab adad adae adao adba adda addd adde addo adea adeb adee adeo adob adod adoe adoo advb aede aeva aoba avab avao avda avea aveo avva avvo baaa baad baba babb babe babo bada badb badd bade bado baed bava bave bbad bbbb bbdd bbdo bbeb bdav bead beav beba bebb bebe bebo beda bede bedo beeb beed beo- beod bevo boab boad boba bobb bobe bobo boda bodb bode bodo boea boee boeo boob bood booe bova bove bovo d-bo daab daad daae daba dabb dabo dada dade dado daeb dava dave dddd dead deae deba debe deda dedd dede dedo deeb deed deev deva deve devo doab doae doba dobb dobe dod- doda dodd dode dodo doea doob dood dove dvda dvoa eaba eada eadb eadd eave ebba ebbo ebed eboe eboo edad edda edde eddo ede- edea edod edve eede eeea eeee eeva eode evae evdb evea evoe evoo o-eo oade obad obba obbo obea obed oboe odbo odda oddd odea oded odeo odoo odva oedo ooaa ooba oobe ooda oooo ovda ovde ovee ovo- ovod ovoo vaad vada vade vado vava veba veda vede vedo veve vevo voad voda vode vodo vvob vvvv