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A Sonoma-based pizza chain that has served the area for more than six decades is closing some of its locations. Mary’s Pizza Shack announced over the weekend that its Dixon, Novato and Napa locations are now permanently closed. In a Facebook post, the company said the closures are “a necessary action” as it looks toward its future. Mary’s Pizza Shack cited increased food and labor costs as two of the reasons that led to the decision. The other Sonoma County locations along with the Vacaville and Fairfield locations will remain open.