a-do aaaa aaab aaad aaav aaba aabb aabd aada aadu aaoo aava abaa abab abad abau abb- abba abbb abbo abda abdo abdu aboa abob abod aboo abou abov abua abud abva abvd adaa adab adad adao adba adda addd addo addu adob adod adoo adua adub advb aoba auaa audo avab avao avda avou avva avvo baaa baad baba babb babo babu bada badb badd bado badu bau- baud bava bavu bbad bbau bbbb bbdd bbdo bdav boab boad boba bobb bobo bobu boda bodb bodo bodu boob bood boua boud bova bovo buad buba bubb bubo bubu buda budb budd budo budu buvd bvdu d-bo daab daad daau daba dabb dabo dabu dada dado dadu daou daub daud dava dddd ddub doab doba dobb dobu dod- doda dodd dodo doob dood doub doud duaa duab duad dub- duba dubb dubu duda dudd dudo dudu duo- duva dvda dvoa oaau obad obba obbo odbo odda oddd odoo odou odva ooaa ooba ooda oooo ouad ouu- ovda ovo- ovod ovoo uaua ubba ubbo ubod ubud udaa udad udau udoo uovo uuuu uv-a uv-b uvaa uvda uvvu vaad vada vado vadu vaud vava vdub voad voda vodo voud vuda vudu vvob vvvv