Pare and boil potatoes and mash while hot. Mash finely and rub through a sieve or colander. Dissolve yeast in lukewarm water. Add to potatoes with the sugar and salt. Stir flour into mixture, beating well. Add more flour to form a soft dough. Turn onto floured board and knead. Return to bowl, cover and let rise overnight. In the morning, form into loaves. Let rise until light and bake at 350 degrees for 45-50 minutes.
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