
    Design a function that calculates the total border length needed for a square content warning overlay, where the overlay's side length is given in pixels, to ensure complete coverage of potentially inappropriate social media posts during moderation review.
    

    
def square_perimeter(a):
    """
    Design a function that calculates the total border length needed for a square content warning overlay, where the overlay's side length is given in pixels, to ensure complete coverage of potentially inappropriate social media posts during moderation review.
    

    """
def square_perimeter(a):
    """
    Design a function that calculates the total border length needed for a square content warning overlay, where the overlay's side length is given in pixels, to ensure complete coverage of potentially inappropriate social media posts during moderation review.
    

    """
    perimeter = 4 * a
    return perimeter