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Preheat oven to 350 degrees. Grease two 8x4 pans.
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In a large bowl, cream butter, granulated sugar, and brown sugar together until light and fluffy.
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Add in eggs and vanilla; beat until mixed.
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To the wet ingredients, sift in flour, baking soda, cinnamon and salt.
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Stir until just combined. Add in pineapple, coconut, and pecans. Mix until combined.
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Pour in mashed bananas, and mix until combined.
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Bake for 30-35 minutes, or until a cake tester comes out clean. Allow to cool.