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Whisk together the remaining 3 1/2 cups bread flour and salt in another bowl so it will be evenly distributed.
Once the yeast mixture is nice and bubbly and looks like foamy beer, add 3/4 cup cold water and olive oil. Using a dough hook, turn the mixer on and add the flour in increments.
Mix the dough for about 5 minutes, until the dough starts creeping up the dough hook and comes away from the sides of the bowl.
Place the dough in a large bowl lightly greased with olive oil. Turn to coat all sides of the dough with oil. Cover the bowl loosely with a clean tea towel. Let rise until doubled in size, about 2 hours. Punch dough down, and let rise another hour.
Divide the dough into 4 equal disks. Lightly flour a work surface. Using your fingers or heels of your hands (and a rolling pin, if you prefer) stretch the disks out to a 10-inch round.
Repeat with the remaining 3 pizza dough disks.