In a large bowl, combine the rye flour, wheat flour, and salt.
In a smaller bowl, dissolve the sugar and yeast in the lukewarm water. Let it stand for 10 minutes until the yeast activates and becomes frothy.
Pour the yeast mixture into the flour mixture and knead until a firm, but pliable dough forms.
Cover the dough and let it rise for 2 hours, or until doubled in size.
Punch down the dough, shape it into an oblong loaf, and place it in a loaf pan lined with parchment paper.
Let it rise for another 30 minutes.
Preheat the oven to 430°F (220°C) and bake the bread for 50-60 minutes, or until it has a hard, dark brown crust.
Let it cool completely on a wire rack before slicing and serving.
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