Which of the following is an SN2 step? 
Definitions:
Fear Structure
A cognitive framework representing an individual's fears, including information about feared stimuli, fear responses, and meaning of fear experiences.
Lifespan Considerations
The examination and inclusion of developmental stages and changes throughout an individual's life, relevant in fields like healthcare and psychology.
Panic Disorder
A psychiatric disorder characterized by unexpected and repeated episodes of intense fear accompanied by physical symptoms.
Cognitive Symptoms
Mental characteristics such as memory loss, lack of focus, or difficulty in processing information that might indicate a health issue.
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