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basic_colors = ("green", "blue", "red", "yellow")

for color in basket_1.balloon_colors:

    if color not in basic_colors:

        basket_1.balloon_colors.remove(color)

# Remove the colors that are not in basic_colors

# from basket_2

for color in basket_2.balloon_colors:

    if color not in basic_colors:

        basket_2.balloon_colors.remove(color)