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In the Latimer diagram for sulfur, the species that would disproportionate are SO3^2- and S2O3^2-. Disproportionation occurs when a species acts as both an oxidizing and reducing agent, resulting in the formation of a higher and a lower oxidation state of the same element. For SO3^2-, it can be oxidized to SO4^2- (higher oxidation state) and reduced to S (lower oxidation state). Similarly, S2O3^2- can be oxidized to SO4^2- and reduced to S.