 The first calls into question the Fregean’s claim to have provided a plausible solution to Frege’s puzzle. The Fregean resolves instances of Frege’s puzzle by positing differences in sense to explain apparent differences in truth-value. But this sort of solution, if pursued generally, seems to lead to the surprising result that no two expressions can have the same content. For consider a pair of expressions which really do seem to have the same content, like “catsup” and “ketchup”. (The example, as well as the argument to follow, is borrowed from Salmon 1990.) Now consider Bob, a confused condiment user, who thinks that the tasty red substance standardly labeled “catsup” is distinct from the tasty red substance standardly labeled “ketchup”, and consider the following pair of sentences: