Use the following to answer questions : 
-List all the numbers in the set that are elements of R.
Definitions:
Tobacco Use
The habitual act of smoking or using tobacco products.
Chronic PTSD
A long-term condition resulting from exposure to severe stress or trauma, characterized by persistent symptoms of re-experiencing the trauma, avoidance, and hyperarousal.
Social Phobia
Also known as social anxiety disorder; characterized by intense fear or anxiety in social situations, leading to avoidance or distress.
Night Terrors
Intense episodes of fear that occur during sleep, typically in children, leading to screaming, kicking, and confusion upon waking.
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