-ana aaaa aaab aaan aaba aabb aabt aana aaon aaoo aata aatt abaa abab aban abat abb- abba abbb abbo abbt aboa abob abon aboo abot abta ana- anaa anab anan anao anat anba anbb anbo anna annb anno annt ano- anoa anon ant- anta anto antt aoba aonb aono aont at-t ataa atab atan atat atna atno atob aton atot atta attn atto baaa baan baat baba babb babo bana bann bano bant baon bata batn bato batt bbbb bnta boab boan boat boba bobb bobo bona bonn bono bont boob boon boot bota botb botn boto bott btaa btan btob bttb naaa naab naan naat naba nabo nan- nana nanb nann nano nant naot nata nato natt nbaa nbbo nnnn nnot nntn noaa noat noba nobo non- nona nonn nono nont noo- noob noon nooo noot not- nota noto nott ntto oban obba obbo obon obot onab onan onat onna onno onon ont- onto ooaa ooba oona oont oooo ootb otan oto- oton otoo otta otto taa- taan taat taba tabb tabo tana tann tano tant taoa tata tatb tato tatt tbta toab toan toat toba tobo tobt tona tonb tonn tono tooa toon toot tota toto tott ttab ttbb tton tttt