The nervous system consists of the brain, the spinal cord, nerves, and motor neurons. Where should a colon be added to this sentence?
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The nervous system consists: of the brain, the spinal cord, nerves, and motor neurons.

You cannot add a colon to this sentence as it is constructed.

The nervous system consists of: the brain, the spinal cord, nerves, and motor neurons.

The nervous system: consists of the brain, the spinal cord, nerves, and motor neurons.