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Place semisweet chocolate in microwave-safe 8-cup measuring cup or large bowl.
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Place white chocolate in microwave-safe 2-cup measuring cup or medium bowl.
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Heat semisweet chocolate in microwave, covered with waxed paper, on High 2 to 3 minutes or until almost melted, stirring once. Remove from microwave and stir until smooth.
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Heat white chocolate in microwave, covered with waxed paper, on High 1 to 2 minutes or until almost melted, stirring once. Remove from microwave and stir until smooth.
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Stir 1 cup pistachios and 1 cup cherries into semisweet chocolate.
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On large cookie sheet, spread chocolate mixture to about 1/4-inch thickness.
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Spoon dollops of white chocolate onto semisweet-chocolate mixture.
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With tip of knife, swirl chocolates together for marbled look.
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Sprinkle with remaining pistachios and cherries.
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Refrigerate bark 1 hour or until firm.
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Break bark into pieces.
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Store in tightly sealed container in refrigerator up to 1 month.
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Pack in decorative boxes lined with waxed tissue paper or colored cellophane for gift giving.