-ana aaaa aaab aaan aaar aaav aaba aabb aana aaon aaoo aara aaro aava abaa abab aban abar abb- abba abbb abbo abbr aboa abob abon aboo abor abov abra abro abva ana- anaa anab anan anao anar anba anbb anbo anna annb anno ano- anoa anon anor aoba aonb aono aora aorb aorn arab aran arar arba arna arno aroa arob aron aroo aror arr- arra arro arrr arva arvn arvo avab avan avao avar avon avor avra avro avva avvo baaa baan baar baba babb babo babr bana bann bano banr baon bar- bara barb barn baro barr bava bbbb bnor bnrr boab boan boar boba bobb bobo bona bonn bono boob boon boor bor- bora born boro borr bova bovo brab bran brao brav brna brno broa brob bron broo bror brrr naaa naab naan naar naba nabo nan- nana nanb nann nano naor nara narn naro narr nava navo navr navv nbaa nbar nbbo nnnn noaa noba nobo non- nona nonn nono noo- noob noon nooo noor noov nor- nora norb norn noro norr norv nov- nova novo nrab nrna nron oara oban obba obbo obon obor obra obro onab onan onar onna onno onon onor onra ooaa ooba oona oooo oora orab oran orao orar orav orba orbb orbo orna orno oro- oron oror orra orro orvr ovan ovar ovo- ovon ovoo ovra raab raan raba rabb rabo rana rann rano raob rara rarb raro rava rbbb rbbr rnbr roab roan roar rob- roba robb robo rona rono roob roon roor rora roro rova rovo rrna rrrr vaan vaar vana vann vano vara varn varr vava vnav voar vona vonn voor vor- vora voro vran vrav vrba vrnn vron vvob vvvv