In a large bowl, combine the cornmeal and all-purpose flour, then add the salt and sugar.
In a separate bowl, dissolve the yeast in lukewarm water and let it stand for 5-10 minutes, until foamy.
Pour the yeast mixture into the flour mixture and add the olive oil. Mix to combine, then start kneading the dough.
Knead the dough for about 10 minutes, until smooth and elastic.
Cover with a clean kitchen towel and let rise in a warm place for about 1.5 hours, or until doubled in size.
Shape the dough into a round loaf and place it on a baking sheet lined with parchment paper.
Cover again and let rest for another 30 minutes.
Preheat the oven to 400°F (200°C) and bake the bread for 35-40 minutes, or until golden brown and sounds hollow when tapped.
Let it cool completely on a wire rack before slicing and serving.
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