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Logic Puzzle # 19: Can you spot the solvent?

Residual solvents are typically organic volatile chemicals that are not completely removed from the sample. Many residual solvents exhibit a characteristic pattern when examined via NMR. The goal of this puzzle is to identify a residual solvent by NMR.

The aliphatic region of the 1H NMR spectrum below is for an unknown acquired in CDCl3. Are any residual solvents evident?