Heat oven to 350 oF.
Grease and flour square pan, 8x8x2 inches. In small mixing bowl combine flour, sugar, cocoa, and salt. Add water, oil, vinegar and vanilla; beat until smooth.
Pour into prepared pan. Sprinkle chocolate chips over top.
Bake 35 - 40 minutes or until wooden pick inserted in center comes out clean.
Cool in pan on wire rack. Cut into squares .
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