#includeOutput: `orange pear banana apple` In this example, we create an unordered_set of strings and insert several items. Since "apple" is already present in the set, it is not inserted again. The items are then printed out in no particular order using a range-based for loop. The unordered_set is part of the C++ Standard Library.#include using namespace std; int main() { unordered_set set; set.insert("apple"); set.insert("banana"); set.insert("orange"); set.insert("pear"); set.insert("apple"); // duplicate, not inserted for (const auto& item : set) { cout << item << " "; } return 0; }