-ana aaaa aaab aaan aaas aaba aabb aabt aana aaon aaoo aasa aass aast aata aatt abaa abab aban abas abat abb- abba abbb abbo abbs abbt aboa abob abon aboo abos abot abs- absa abss abta abts ana- anaa anab anan anao anas anat anba anbb anbo anna annb anno anns annt ano- anoa anon anos ansa anso ant- anta anto ants antt aoba aonb aono aont aoss asaa asab asan asao asas asat asba asbo asno asob ason asos asot assa assn asso asss asst asta astb asto asts at-t ataa atab atan atas atat atbs atna atno atns atob aton atos atot atsb atst atta attn atto atts baaa baan baas baat baba babb babo babs bana bann bano bans bant baon baos basa baso bass bast bata batn bato bats batt bbas bbbb bbbs bnas bnss bnta boab boan boas boat boba bobb bobo bobs bona bonn bono bons bont boob boon boos boot bosa bosn boso boss bost bota botb botn boto bots bott bsaa bsas bsat bsns bson bsos bsts btaa btan btob btss bttb naaa naab naan naas naat naba nabo nabs nan- nana nanb nann nano nans nant naos naot nas- nasa nasb naso nass nast nata nato nats natt nbaa nbas nbbo nnnn nnos nnot nnsa nnss nntn noaa noat noba nobo nobs non- nona nonn nono nons nont noo- noob noon nooo noos noot nos- nosa noss nost not- nota noto nots nott nsaa nsbo nsna nsos nssa nssb nsso nsss nsts ntsb ntss ntto oass oast oats oban obas obba obbo obon obos obot obsn obss obst obts onab onan onas onat onna onno onon onos onso onst ont- onto ooaa ooba oona oons oont oooo ooos oosa oost ootb oots osan osas osat osba osno osoo osos ossa ossb osso osta osts otan otas otbs oto- oton otoo otos otsa otso otta otto otts s-os saab saan saas saat saba sabb sabo sabs sana sann sano sans sant saon saos sasa saso sass sast sata satb satn sato sats satt sbaa sbas sbbs sbot sbsa sbst sbtn snab snas snat snba snns snoa snob snoo snos snot soan soas soat soba sobo sobs sobt son- sona sono sons sont soon soos soot sosa soso soss sost sota sotn soto sots ssaa ssab ssan ssao ssas ssat ssbn ssns ssot sssa sssb ssss ssta sstb ssts stab stan stas stat stbs stnn stns stoa stob ston stoo stos stot stss taa- taan taas taat taba tabb tabo tabs tana tann tano tans tant taoa taos tasa tasb tass tast tata tatb tato tats tatt tbas tbbs tbst tbta tnts toab toan toas toat toba tobo tobs tobt tona tonb tonn tono tons tooa toon toos toot tosa tosb toso toss tost tota toto tots tott tsaa tsao tsat tsna tsob tsos tssa tsst tsts ttab ttbb tton ttss tttt