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A physics student wants to investigate the transport properties of a newly synthesized material. The student knows that the electrical conductivity of the material is dependent on its temperature and the presence of impurities. Design an experiment to measure the electrical conductivity of the material as a function of both temperature and impurity concentration. Analyze the results to determine the nature of the material's conductivity and the effect of impurities on its transport properties.
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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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