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You either:
1. dont have a valid key ("access denied")
2. dont have your app_Id set correctly("steamworks not initialised")
3. got ddosed for too many requests (try a different steam account)
4. need to restart steam
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numbers = [1, 2, 3, 4, 5]
squared = [x**2 for x in numbers]
print(squared) # Output: [1, 4, 9, 16, 25]