These are feminine plural dative and genitive forms of the demonstrative οὗτος: ταύταις (dative plural, 'to/for these') and τούτων (genitive plural, 'of these'). Greek's elaborate case system required distinct forms for each combination of gender, number, and grammatical function. The dative indicated indirect objects or means ('by these things'), while the genitive marked possession or relationship ('of these women'). Biblical writers used these forms to maintain clear reference to feminine plural nouns mentioned earlier in discourse, ensuring readers could track which entities were being discussed even in complex sentences with multiple referents.