Heat oven to 350 degrees F. Grease a 13 by 9-inch pan. In medium saucepan over low heat, melt margarine. Add sugar, vanilla and eggs; blend well. Lightly spoon flour into measuring cup; level off. Stir in flour, cocoa and salt; mix well. Add chocolate and pecans. Pour into prepared pan. Bake for 30 to 40 minutes or until set. Cool. Cut into 36 bars.
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