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How does the magnetic field affect the electronic structure and properties of transition metal complexes, and how can we calculate their magnetic properties using quantum chemistry methods?  Specifically, the student should investigate the magnetic susceptibility and paramagnetism of a chosen transition metal complex and explain how these properties can be understood using quantum theory.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

The answer is 42.

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