-ana aaaa aaab aaan aaap aaar aaba aabb aabp aana aanp aapa aara aarp abaa abab aban abap abar abb- abba abbb abbr abpa abpn abpp abpr abra ana- anaa anab anan anap anar anba anbb anna annb anp- anpa anpp anpr apan apap apar apba apbr apna appa appr apra aprn arab aran arap arar arba arna arpa arr- arra arrr baaa baan baar baba babb babr bana bann banp banr bapa bapp bar- bara barb barn barr bbbb bbpr bnpp bnrr brab bran brna brrr naaa naab naan naar naba nan- nana nanb nann nanp napa napb napp nara narn narp narr nbaa nbap nbar nbpa nbpp nnnn nnpr npap nppa npra nrab nrap nrna nrpn paan paap paar paba pan- pana pann papa papb papp papr par- para parn parp parr pban pbar pbpa pnar pnpp pnra ppan ppap ppar pppa pppn pppp pran prar prna prnp raab raan raba rabb rana rann rapa rapp rara rarb rbbb rbbr rnbr rppn rrna rrrr