Combine first 4 ingredients in a large bowl. Cover and chill 8 hours. Remove orange slices, and discard. Press berry mixture through a sieve over a bowl; discard solids. Combine berry mixture, juice, and sugar in an 8 inch dish, stirring until sugar dissolves. Cover and freeze 45 minutes. Stir berry mixture with a fork every 45 minutes until completely frozen and slushy (about 4 hours).
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