-ana aaaa aaab aaan aaap aaar aaba aabb aabp aana aanp aaon aaoo aapa aapo aara aaro aarp abaa abab aban abap abar abb- abba abbb abbo abbr aboa abob abon aboo abor abpa abpn abpp abpr abra abro ana- anaa anab anan anao anap anar anba anbb anbo anna annb anno ano- anoa anon anor anp- anpa anpp anpr aoba aonb aono aopo aora aorb aorn apan apao apap apar apba apbr apna apno apo- apon apoo apop apor appa appr apra aprn apro arab aran arap arar arba arna arno aroa arob aron aroo aror arpa arr- arra arro arrr baaa baan baar baba babb babo babr bana bann bano banp banr baon bapa bapp bar- bara barb barn baro barr bbbb bbpr bnor bnpp bnrr boab boan boar boba bobb bobo bona bonn bono boob boon boop boor bopa bopp 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 nanp naor napa napb napo napp nara narn naro narp narr nbaa nbap nbar nbbo nbpa nbpp nnnn nnpr noaa noap noba nobo non- nona nonn nono noo- noob noon nooo noop noor nor- nora norb norn noro norr npap nppa npra nrab nrap nrna nron nrpn oara oban obba obbo obon obor obra obro onab onan onar onna onno onon onor onra ooaa ooba oona oooo oora opan opap opar opo- opon opor oppa oppo opra orab oran orao orar orba orbb orbo orna orno oro- oron oror orra orro paan paap paar paba pan- pana pann pano paon papa papb papp papr par- para parn paro parp parr pban pbar pbpa pnar pnon pnpo pnpp pnra pnro poan poar poba pobo pona pono ponp poon poop poor pop- popa popo popp pora porb porn poro porr ppan ppap ppar ppoa pppa pppn pppo pppp pran prao prar prna prnp pro- proa prob pron proo prop raab raan raba rabb rabo rana rann rano raob raop rapa rapp rara rarb raro rbbb rbbr rnbr roab roan roap roar rob- roba robb robo rona rono roob roon roop roor ropa ropo rora roro rpob rpon rppn rrna rrrr