Check Duplicates in Array

Write a Python function `contains_duplicates` that determines whether a given list of integers contains any duplicate elements. The function should return `True` if there are duplicates and `False` otherwise.

#### Example Usage
```python [main.nopy]
print(contains_duplicates([1, 2, 3, 4, 5]))  # Output: False
print(contains_duplicates([1, 2, 3, 4, 4]))  # Output: True
print(contains_duplicates([1, 1, 2, 2, 3, 3, 4, 4, 5]))  # Output: True
```

#### Constraints
- The input will always be a list of integers.
- The list can be empty, in which case the function should return `False`.

def contains_duplicates(nums):
    """
    Determine if the list contains any duplicate elements.

    Args:
        nums (list): A list of integers.

    Returns:
        bool: True if duplicates exist, False otherwise.
    """
    # Placeholder for the solution
    pass

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Intermediate lists sets functions conditionals

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