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In honor of the Salon de Chocolat (which I didn’t go to this year) this month’s walking tour takes you to some of Saint-Germain’s best chocolatiers. After all, you can toss an M&M in any direction in the sixth arrondisement and hit a world-class chocolatier—especially now that Patrick Roger has opened two new boutiques there. Start at one of them, 91 rue de Rennes, and see what magical windo…