-ana aaaa aaab aaan aaas aaba aabb aana aaon aaoo aasa aass abaa abab aban abas abb- abba abbb abbo abbs aboa abob abon aboo abos abs- absa abss ana- anaa anab anan anao anas anba anbb anbo anna annb anno anns ano- anoa anon anos ansa anso aoba aonb aono aoss asaa asab asan asao asas asba asbo asno asob ason asos assa assn asso asss baaa baan baas baba babb babo babs bana bann bano bans baon baos basa baso bass bbas bbbb bbbs bnas bnss boab boan boas boba bobb bobo bobs bona bonn bono bons boob boon boos bosa bosn boso boss bsaa bsas bsns bson bsos naaa naab naan naas naba nabo nabs nan- nana nanb nann nano nans naos nas- nasa nasb naso nass nbaa nbas nbbo nnnn nnos nnsa nnss noaa noba nobo nobs non- nona nonn nono nons noo- noob noon nooo noos nos- nosa noss nsaa nsbo nsna nsos nssa nssb nsso nsss oass oban obas obba obbo obon obos obsn obss onab onan onas onna onno onon onos onso ooaa ooba oona oons oooo ooos oosa osan osas osba osno osoo osos ossa ossb osso s-os saab saan saas saba sabb sabo sabs sana sann sano sans saon saos sasa saso sass sbaa sbas sbbs sbsa snab snas snba snns snoa snob snoo snos soan soas soba sobo sobs son- sona sono sons soon soos sosa soso soss ssaa ssab ssan ssao ssas ssbn ssns sssa sssb ssss