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What is the optimal fuel composition (i.e. the percentage of enriched uranium and other components) required for a pressurized water nuclear reactor to achieve maximum efficiency and safety? Factors to consider include reactor design, fuel rod geometry, and coolant flow rate. Calculate the expected power output and reactor lifespan under different fuel composition scenarios.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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