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Preheat oven to 350 degrees Fahrenheit.
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Mix the flours, sugar, baking soda, baking powder, and salt in a large bowl.
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In a separate bowl, mash the bananas and stir in the eggs, beer and then add in the coconut oil. Stir to mix well.
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Mix the wet into the dry ingredients and stir to combine. Fold in the chopped walnuts.
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Transfer mixture to a greased loaf pan and bake for 45 minutes, until a toothpick comes out clean.