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Heat the olive oil over medium-low heat in a large, heavy soup pot or Dutch oven. Add the onion, carrots and celery. Cook, stirring, until beginning to soften, about three minutes. Add 1/2 teaspoon salt and the leek. Continue to cook, stirring often, until tender, about three minutes. Add the garlic, stir for about a minute, and then stir in the water, tomato paste and the bouquet garni. Bring to a simmer. Add salt to taste, reduce the heat to low, cover and simmer 30 minutes. Stir in the chickpeas. Taste and adjust salt. Remove the bouquet garni.
Add the Swiss chard and the pasta to the soup, bring back to a simmer, and simmer another 10 minutes or until the pasta is cooked al dente. Grind in some pepper, taste and adjust seasonings. It should be savory and rich-tasting. Serve in wide soup bowls, with a sprinkling of Parmesan over the top.