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list1 = [1, 2, 3, 4]
list2 = [3, 4, 5, 6]
unique_to_list1 = set(list1) - set(list2)
unique_to_list2 = set(list2) - set(list1)
# Combining the unique elements
unique_items = unique_to_list1.union(unique_to_list2)
print(unique_items) # Output will be {1, 2, 5, 6}