a-ii aaaa aaab aaai aaas aaba aabb aabi aaib aaii aais aasa aasi aass abaa abab abai abas abb- abba abbb abbi abbs abia abib abis abs- absa absi abss aiai aias aiba aiia aiib aisa aisb aisi asaa asab asai asas asba asia asii asis assa assi asss ba-i baaa baas baba babb babi babs baia baib bais basa basi bass bbas bbbb bbbs bias biba bibb bibi bibs biis bis- bisa biss bsaa bsas iaaa iaai iaas iaba iaia iais iasa iasi ibas ibia ibis ibsa ibss iias iiii iiis iisi is-a isai isas isba isia isis issa issi isss s-ib s-ii saab saas saba sabb sabi sabs saia sais sasa sasi sass sbaa sbai sbas sbbs sbsa sbsi siaa siab siai sias siba sibi sibs sisa sisi siss ssaa ssab ssas ssis sssa sssb sssi ssss