Identify the nucleophile and type of substitution reaction in the following: 
Definitions:
Neural System
The network of nerve cells and fibers that transmits nerve impulses between parts of the body, including the brain and spinal cord.
Fast Mapping
A cognitive process by which children rapidly learn the meaning of a word after just a few exposures, contributing significantly to vocabulary growth.
Overextension
A language error, common in early child language acquisition, where a child applies a word too broadly to objects or actions that don't fit the word's meaning.
Pragmatics
The area of linguistics that deals with language usage in societal settings and the process by which individuals create and grasp meanings through language.
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