-ana aaaa aaab aaan aaap aaba aabb aabp aana aanp aaon aaoo aapa aapo abaa abab aban abap abb- abba abbb abbo aboa abob abon aboo abpa abpn abpp ana- anaa anab anan anao anap anba anbb anbo anna annb anno ano- anoa anon anp- anpa anpp aoba aonb aono aopo apan apao apap apba apna apno apo- apon apoo apop appa baaa baan baba babb babo bana bann bano banp baon bapa bapp bbbb bnpp boab boan boba bobb bobo bona bonn bono boob boon boop bopa bopp naaa naab naan naba nabo nan- nana nanb nann nano nanp napa napb napo napp nbaa nbap nbbo nbpa nbpp nnnn noaa noap noba nobo non- nona nonn nono noo- noob noon nooo noop npap nppa oban obba obbo obon onab onan onna onno onon ooaa ooba oona oooo opan opap opo- opon oppa oppo paan paap paba pan- pana pann pano paon papa papb papp pban pbpa pnon pnpo pnpp poan poba pobo pona pono ponp poon poop pop- popa popo popp ppan ppap ppoa pppa pppn pppo pppp