a-ii aaaa aaab aaaf aaai aaba aabb aabi aabt aafa aafb aaff aafi aaib aaii aata aatf aatt abaa abab abaf abai abat abb- abba abbb abbi abbt abff abia abib abit abta afaa afat affa affi afft afia afib afif afit afta aiai aiba aiff aiia aiib aita aitf aiti aitt at-t ataa atab atai atat atfb atia atif atit atta atti ba-i baaa baaf baat baba babb babi baff baft baia baib bait bata batf bati batt bbbb bfta bftt biaf biat biba bibb bibi bifa biff bifi bita bitt btaa btaf bttb faaa faba fabi fafa faff fafi fait fata fatf fati fatt ffff ffii fftf fiaa fiaf fiat fiba fifa fiff fifi fift fiii fita fiti fitt ftii iaaa iaai iaat iaba iaff iaia iata iati ibat ibfi ibia ibtb ifaa ifat ifbb ifit ifta iifa iiii iiit iita iitt itaa itaf itai itat itfa itia itif itta ittf taa- taaf taat taba tabb tabi tafa taff tafi taft taia tait tata tatb tati tatt tbaf tbit tbta tiaa tiab tiaf tiba tibi tifa tiff tift tiit tita titi titt ttab ttbb ttfa ttff tttt