 The strong third-person forms function simultaneously as generic demonstratives ('this, that').The strong forms of the third person in the genitive (αυτού, αυτής, αυτών, αυτούς) have optional alternative forms extended by an additional syllable or (αυτουνού, αυτηνής, αυτωνών).In the plural, there exists the alternative accusative form αυτουνούς.