In large bowl, combine all-purpose flour, salt, cocoa, yeast, and caraway seed. Heat and stir molasses, butter, sugar, 2 cups water and 2 Tablespoons oil until warm (about 110degrees-115degreesF). Add to dry mixture. Beat at low speed on electric mixer 1/2 minutes, scraping bowl. Beat 3 minutes at high speed. Then by hand, stir in enough rye flour to make a soft dough. Turn out onto lightly floured surface; knead till smooth (about 5 minutes). **Cover, and let rest 20 minutes. Punch down dough. Divide in half. Shape into 2 round or oval loaves on greased baking sheets. Brush with small amount of cooking oil. Slash tops with knife. Cover; let rise until double (45-60 minutes). Bake at 400 degrees for 25-30 minutes. Remove from baking sheets, place on racks to cool. **Note:If using this recipe to make a light/dark"marbled" rye loaf, knead both the light and dark doughs separately for about 3 minutes or so, then combine the light and dark doughs and knead them together for another minute or so (to produce the marbled effect). Proceed with the recipe as stated.