In a large mixer bowl, dissolve yeast in 1/2 cup of water. Add sugar, oil, salt rye or whole wheat flour, 3 cups all-purpose flour and remaining water; beat until smooth. Add enough remaining all-purpose flour to form a soft dough. Knead on floured surface until smooth and elastic, about 6 to 8 minutes. Place in greased bowl; turn once to grease top. Cover and let rise in warm place until double in size, about 1 hour.
Punch the dough down. Divide in half. On a greased baking sheet, flatten each half to 1 inch thickness. Pierce each loaf several times with a fork. Cover and let rise in a warm place until nearly double in size, about 30 minutes. Bake at 375 °F for 25 to 30 minutes or until golden brown.