import copy

# Create a list with a nested list
original_list = [1, 2, [3, 4]]

# Use the deepcopy() function to create a deep copy of the list
copied_list = copy.deepcopy(original_list)

# Modify the original list
original_list[2][0] = 10

# Print both lists
print("Original list:", original_list)
print("Copied list:", copied_list)