-ana aaaa aaab aaan aaav aaba aabb aana aaon aaoo aava abaa abab aban abb- abba abbb abbo aboa abob abon aboo abov abva ana- anaa anab anan anao anba anbb anbo anna annb anno ano- anoa anon aoba aonb aono avab avan avao avon avva avvo baaa baan baba babb babo bana bann bano baon bava bbbb boab boan boba bobb bobo bona bonn bono boob boon bova bovo naaa naab naan naba nabo nan- nana nanb nann nano nava navo navv nbaa nbbo nnnn noaa noba nobo non- nona nonn nono noo- noob noon nooo noov nov- nova novo oban obba obbo obon onab onan onna onno onon ooaa ooba oona oooo ovan ovo- ovon ovoo vaan vana vann vano vava vnav vona vonn vvob vvvv