In a small bowl, combine flour, cocoa and baking soda. Blend well. In a large bowl, beat sugar, brown sugar and butter until fluffy. Add vanilla and eggs; beat well. Add flour mixture and blend well. Chill the dough for at least 2 hrs then work with 1/4 at a time. Shape 1 heaping teaspoon of dough around 1 Rolo completely covering it. Put sugar in a small bowl and roll each ball of dough in the sugar. Place 2 inches apart on ungreased cookie sheet. Bake at 350 degrees for 7-10 mins, until set and slightly cracked. Cool 5 mins on sheet and remove.
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