a-ii a-ya aaaa aaab aaaf aaai aaba aabb aabi aaby aafa aafb aaff aafi aaib aaii abaa abab abaf abai abay abb- abba abbb abbi abby abff abia abib abiy abyy afaa affa affi affy afia afib afif aiai aiba aiff aiia aiib aiyf ayay ayya ba-i baaa baaf baba babb babi baby baff baia baib baya bayi bbay bbbb biaf biba bibb bibi bifa biff bifi biya faaa faba fabi fafa faff fafi faya ffff ffii fiaa fiaf fiba fifa fiff fifi fiii fyfi i-by iaaa iaai iaba iaff iaia ibfi ibia ibyi ifaa ifbb ifby iffy iifa iiii iyai yaaf yaba yafa yaff yaya yifa yiff yyff yyyy