What are the possessive pronouns of neuter in Genitive, Prepositional, Dative and Instrumental cases? For example the interrogative possessive чей is чьё in both Nom and Acc. But in Gen, Prep, Dat and Instr? The мой is моё in Nom and Acc, and the reflexive possessive pronoun свой is своё in Nom and Acc. What about in the other cases?