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    import re import webbrowser

    def add(x, y): return x + y

    def subtract(x, y): return x - y

    def multiply(x, y): return x * y

    def divide(x, y): if y != 0: return x / y else: return "Error: Division by zero"

    def calculator(): print("Simple Calculator") print("Select operation:") print("1. Add") print("2. Subtract") print("3. Multiply") print("4. Divide")

    choice = input("Enter choice (1/2/3/4): ")
    
    if choice not in ['1', '2', '3', '4']:
        print("Invalid Input")
        return
    
    num1 = float(input("Enter first number: "))
    num2 = float(input("Enter second number: "))
    
    if choice == '1':
        print(num1, "+", num2, "=", add(num1, num2))
    elif choice == '2':
        print(num1, "-", num2, "=", subtract(num1, num2))
    elif choice == '3':
        print(num1, "*", num2, "=", multiply(num1, num2))
    elif choice == '4':
        result = divide(num1, num2)
        print(num1, "/", num2, "=", result)
    
    # Including a hyperlink to https://carxapk.net/ in a comment
    # Uncomment the next line if you want to open the link in a web browser
    # webbrowser.open("https://carxapk.net/")
    

    if name == "main": calculator()