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The strict security protocols governing the movements of President Sergio Mattarella of Italy dictate that he is not permitted to appear in the same location repeatedly. He is, in this respect and probably this respect alone, like lightning: He is not supposed to strike twice.
In rare circumstances, the rules can be bent. So last month, Mr. Mattarella was in attendance twice at track and field’s European Championships in Rome: once for the final of the men’s 100 meters, and once for the 4x100-meter relay.