@neheller The note currently tests whether bases are electron acceptors or donors via c2. The same is done for acids by nid 1555639334164. While it doesn’t specifically test whether donors are acids or bases, the connection required to be made by associating bases with electron donors, not acceptors, would also allow you to realize/determine the same connection backwards. With this said, I will close this suggestion for now but if you’d like to still have this suggestion, please feel free to resubmit with expanded rationale on what c2 doesn’t offer that would be improved by having c3, as you included
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