-ana aaaa aaab aaaf aaan aaas aaba aabb aafa aafb aaff aana aasa aasf aass abaa abab abaf aban abas abb- abba abbb abbs abff abs- absa absf abss afaa afan afbs affa affs afsa afsb ana- anaa anab anan anas anba anbb anfa anna annb anns ansa ansf asaa asab asaf asan asas asba asfa assa assn asss baaa baaf baan baas baba babb babs baff bana bann bans basa basf bass bbas bbbb bbbs bbfn bfas bffs bnas bnss bsaa bsas bsfa bsff bsfs bsns faaa faan faas faba fabs fafa faff fana fans fasa fasn fass ffff ffsa ffss fsas fssa fssf naaa naab naan naas naba nabf nabs nafa naff nafs nan- nana nanb nann nans nas- nasa nasb nasf nass nbaa nbaf nbas nbfa nfaa nfas nfff nnnn nnsa nnss nsaa nsfs nsna nssa nssb nssf nsss saab saaf saan saas saba sabb sabs safa safb saff sana sann sans sasa sasf sass sbaa sbas sbbs sbsa sfas sfba sfnb sfss snab snas snba snns ssaa ssab ssan ssas ssbn ssns sssa sssb sssf ssss