Combine the flour, sugar, salt, baking soda, and cocoa powder in a bowl until thoroughly combined. Create a well in the center of the dry ingredients, and add the vanilla, oil, vinegar, and water. Mix until just combined. Pour into your prepared pan, and bake in the preheated oven for 30 minutes, until a toothpick comes out clean. If cooking cupcakes, check the doneness after 15 minutes.
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