-ana aaaa aaab aaan aaar aaba aabb aana aaon aaoo aara aaro abaa abab aban abar abb- abba abbb abbo abbr aboa abob abon aboo abor abra abro 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 baaa baan baar baba babb babo babr bana bann bano banr baon bar- bara barb barn baro barr bbbb bnor bnrr boab boan boar boba bobb bobo bona bonn bono boob boon boor bor- bora born boro borr brab bran brao brna brno broa brob bron broo bror brrr naaa naab naan naar naba nabo nan- nana nanb nann nano naor nara narn naro narr nbaa nbar nbbo nnnn noaa noba nobo non- nona nonn nono noo- noob noon nooo noor nor- nora norb norn noro norr 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 orba orbb orbo orna orno oro- oron oror orra orro raab raan raba rabb rabo rana rann rano raob rara rarb raro rbbb rbbr rnbr roab roan roar rob- roba robb robo rona rono roob roon roor rora roro rrna rrrr