Stir together the flour, yeast, and salt together, Slowly mix in 11 fl oz of water. Mix until a dough forms, then very, very, slowly add the remaining 3 ⅓ fl oz of water. Knead for about 8 minutes, or until the dough is smooth and elastic. Since this is a very wet dough, I recommend using a mixture with a dough hook attachment. Whatever you do, do NOT add more flour.
Rub the inside of a large, square bowl (yes, you must use a square bowl, it helps the dough maintain it's bubbles when you tip it out which is important!) with the olive oil and place the dough into the bowl. Cover with a tea towel or greased plastic wrap and allow to rise for about 1 hour and 45 minutes. It is very important to not disturb the dough, or do anything that may make it lose the bubbles it is not forming as it rises.
Lightly dust a flat surface with extra flour and some of the semolina flour, do the same with two baking sheets. Very carefully tip the dough onto the floured surface while maintaining as many bubbles within the dough as possible. Do not punch the dough down!! Use a knife of bench scraper dusted with flour to cut the dough into quarters. Gently transfer each quarter onto the baking sheets - two per baking sheet. Again, be careful to not deflate the dough as much as possible.
Gently stretch out the dough until it is about 9 - 10 inches, then carefully cover. Allow to rise for 30 minutes. Sprinkle the top of the ciabatta with more flour and semolina.
Preheat the oven to 425 degrees F. Either spray the oven with water before adding the baking sheets, or place an oven safe container (I used a cake pan) half-filled with water at the bottom of the oven. Add in the baking sheets and bake for 25 minutes.
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