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1
Combine flour, salt, and yeast in a large bowl and whisk to combine. Add water and stir with a wooden spoon until no dry flour remains. Cover bowl tightly with plastic wrap and let sit at room temperature for at least 12 and up to 24 hours.
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2
Transfer container to refrigerator and let sit for at least 3 and up to 5 days.
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3
Remove dough from refrigerator and turn out onto well-floured surface. Turn once or twice and form into loaf shape. Cover with a well-floured kitchen towel and allow to rise at room temperature for at least two hours, and up to 4.
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4
Meanwhile, adjust oven rack to lower middle position and preheat oven to 450u00b0F, with a heavy cast-iron or stainless steel Dutch oven placed inside it.
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5
When dough has risen, slash top with a floured knife into two or three slashes, 1/2 inch deep. Remove Dutch oven from oven and working quickly, drop dough inside. Place lid back on Dutch oven and return to oven. Bake for 15 minutes, then remove lid and continue to bake until center of bread registers 209u00b0F on an instant read thermometer, about 30 to 45 minutes longer (time will vary depending on shape of loaf).
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6
Remove Dutch oven from oven and remove loaf of bread with a spatula or tongs. Allow to rest on a wire rack for at least 15 minutes before slicing and serving. Unused bread can be stored at room temperature wrapped in foil for up to three days, though it may need to be refreshed in a hot oven or toaster before serving.
