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A Frost diagram for sulfur in a basic solution would show the relative stability of various oxidation states of sulfur under those conditions. The most thermodynamically stable species would be the one at the lowest point on the diagram. In a basic solution, the most stable sulfur species is likely to be sulfide (S²⁻), which has a low oxidation state (-2). However, the exact position of the species on the Frost diagram will depend on the specific pH of the solution and the potential of the electrode used to measure the redox potentials.