a-ii aaaa aaab aaai aaba aabb aabi aabt aaib aaii aata aatt abaa abab abag abai abat abb- abba abbb abbi abbt abia abib abig abit abta agag agai agat agba agga aggi agia agib agig agii agit agta aiai aiba aiga aiia aiib aita aiti aitt at-t ataa atab atai atat atia atit atta atti ba-i baaa baat baba babb babi baga bagg bagi bagt baia baib baig bait bata bati batt bbbb bbga bgia biat biba bibb bibi biga bigb bigg bigt bita bitt btaa bttb gaba gabb gabi gabt gaga gagg gagi gaia gaig gait gata gati gatt gbag ggbt gggg giaa giai giat giba gibb giga gigg gigi gita gtaa gtta iaaa iaai iaat iaba iaia iata iati ibat ibga ibia ibtb igba igga igia iiii iiit iita iitt itaa itai itat itia itta taa- taag taat taba tabb tabi taga tagg tagi taia taig tait tata tatb tati tatt tbit tbta tiaa tiab tiba tibi tiga tigi tiit tita titi titt ttab ttbb tttt