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Find Minimum Difference in Array

Write a Python function `find_min_diff(arr)` that takes a list of integers `arr` and returns the minimum difference between any two elements in the list. The function should handle cases where the list contains at least two elements.

#### Example Usage
```python [main.nopy]
print(find_min_diff([1, 5, 3, 19, 18, 25]))  # Output: 1
print(find_min_diff([4, 3, 2, 6]))           # Output: 1
print(find_min_diff([30, 5, 20, 9]))         # Output: 4
```

#### Constraints
- The input list will contain at least two integers.
- The integers can be positive or negative.
- The function should return the minimum absolute difference between any two elements.
def find_min_diff(arr):
    """
    Find the minimum difference between any two elements in the array.

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

    Returns:
    int: The minimum difference between any two elements.
    """
    # Sort the array to bring closer elements together
    # Initialize the minimum difference to a large value
    # Iterate through the sorted array to find the minimum difference
    pass  # Replace this with your implementation
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