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1
Fold 1 dough round in half and carefully transfer to a 9-inch pie dish. Unfold and ease the round into the pan, without stretching it, and pat it firmly into the bottom and up the sides of the dish. Using kitchen scissors, trim the edge of the dough, leaving 3/4 inch of overhang and reserving any dough scraps. Set the dough-lined pan aside, along with the second dough round, in a cool place until ready to use.
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2
In a small bowl, stir together the sugar, cornstarch, tapioca and salt. Place the strawberries and rhubarb in a large bowl, sprinkle with the sugar mixture and toss to distribute evenly. Immediately transfer to the dough-lined pan. Dot with the butter.
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3
Fold the reserved dough round in half and carefully position it over half of the filled pie. Unfold and trim the edge neatly, leaving 1 inch of overhang, then fold the edge of the top round under the edge of the bottom round and crimp the edges to seal. Gather all of the dough scraps and roll out about 1/8 inch thick. Using a very small cookie cutter, cut out scalloped circles or other shapes of dough. Brush the edge of the crust and the undersides of the dough shapes with cold water and overlap the shapes around the edge of the pie. Using a small, sharp knife, cut 5 or 6 holes or slits in the top crust to allow steam to escape during baking.
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4
Refrigerate the pie until the dough is firm, 20 to 30 minutes. Meanwhile, position a rack in the lower third of an oven and preheat to 350u00b0F.
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5
Bake the pie until the crust is golden and the filling is thick and bubbling, 50 to 60 minutes. Transfer to a wire rack and let cool completely to set. Serve at room temperature or rewarm in a 350u00b0F oven for 10 to 15 minutes just before serving.
