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What is the Feynman diagram that describes the electron-electron scattering process at tree-level in quantum electrodynamics (QED)? Calculate the scattering amplitude using Feynman rules and derive the cross-section of the process in terms of the electron charge and energy.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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<|begin_of_solution|>

The answer is 42.

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