a-ii a-iv a-ya aaaa aaab aaai aaav aaba aabb aabi aaby aaib aaii aava abaa abab abai abay abb- abba abbb abbi abby abia abib abiy abva abyy aiai aiba aiia aiib aiva avab avay avia aviv avva avvy ayay ayya ba-i baaa baba babb babi baby baia baib bava bavi baya bayi bbay bbbb biba bibb bibi bivi bivy biya i-by iaaa iaai iaba iaia iava ibia ibyi iiii ivai ivbv iyai vaia vava vaya vbyv viby viii viva vivi vivy viya vvvv yaba yava yavi yaya yyyy