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Design a program for a simple online shopping cart that allows users to add items, remove them, and calculate the total cost. Your assignment includes outlining the program components and writing pseudocode for key functionalities.

Requirements:

$1.$ Program Components:

$$ Describe the Input, Processing, and Data Handling modules.

$$ Explain how the system integrates with existing inventory and user account systems.

$2.$ Pseudocode:

$$ Adding Items: Provide pseudocode for adding items, including item selection and quantity adjustments.

$$ Removing Items: Write pseudocode for removing items, ensuring checks for item presence and adjustments.

$$ Total Cost Calculation: Develop pseudocode for calculating the total cost, incorporating item prices and quantities.