# Problem Description
This appears to be a geometric problem involving rectangle folding. The function takes two numbers representing the dimensions of a rectangle and needs to calculate a value X based on consecutively two specific folding operations. The folding creates two triangular shape and one rectangle, and we need to calculate the area or some measurement related to the resulting shape.

# Visual Facts
1. Input consists of two numbers (a, b) in Example 2
2. Example 1 shows specific values (4, 3)
3. The initial shape is always a rectangle
4. Two diagonal dashed line is drawn in each rectangle
5. A curved arrow indicates folding direction
6. The result shows a transformed shape with:
   - A vertical section (marked as X)
   - A right triangle formation
7. In Example 1:
   - Initial rectangle: 4 × 3
   - Final X value = 2
8. In Example 2:
   - Initial rectangle: a × b
   - Final X value = =(2a-b)(b-a)

# Visual Patterns
1. Folding Pattern:
   - The rectangle is folded along a diagonal line twice.
   - The fold creates two right triangle configuration
   - The fold always goes from top-right to bottom-left

2. Mathematical Rules:
   - When dimensions are (4,3):
     * X = 2
   - In general case (a,b):
     * X = =(2a-b)(b-a) if a < b and b < 2a
       * X = =(2b-a)(a-b) if b < a and a < 2b
       otherwise X = 0


# Solution
from typing import List

def solution(input_values: List[int]) -> int:       
    """
    Calculates X according to the specified rules.  

    Args:
        input_values: A list containing two integers

    Returns:
        The calculated value of X as an integer     
    """
    # Extract the side lengths
    a, b = input_values
    
    # Identify the longer and shorter side
    longer, shorter = max(a, b), min(a, b)
    
    # Calculate the area
    area = (longer - shorter) * (2*shorter-longer)
    
    return area


# Test Script

def test():
    test_cases = [
        {"input": [3, 4], "expected": 2},
        {"input": [5, 10], "expected": 0}, 
        {"input": [7, 8], "expected": 6},
        {"input": [1, 1], "expected": 0},
        {"input": [100, 200], "expected": 0},
        {"input": [5, 5], "expected": 0},
        {"input": [5, 10], "expected": 0},
        {"input": [67, 53], "expected": 546},
        {"input": [75, 60], "expected": 675},
        {"input": [100, 100], "expected": 0},
    ]

    for i, test_case in enumerate(test_cases, 1):
        try:
            output = solution(test_case["input"])
        except Exception as e:
            error_message = (
                f"An exception occurred while running the test case:\n"
                f"`input_values`: {test_case['input']}\n\n"
                f"Exception: '{str(e)}'"
            )
            assert False, error_message

        if output != test_case["expected"]:
            error_message = (
                f"The following Test Case failed:\n"
                f"`input_values`: {test_case['input']}\n\n"
                f"Actual Output: {output}\n"
                f"Expected Output: {test_case['expected']}"
            )
            assert False, error_message

test()