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#include <iostream> using namespace std; template <typename T> T add(T a, T b) { return a + b; } template <> string add<string>(string a, string b) { return a + b; } template <typename T> class Pair { private: T first; T second; public: Pair(T f, T s) : first(f), second(s) {} T getFirst() const { return first; } T getSecond() const { return second; } }; int main() { int num1 = 5, num2 = 10; cout << "Sum of numbers: " << add(num1, num2) << endl; string str1 = "Hello, "; string str2 = "World!"; cout << "Concatenated string: " << add(str1, str2) << endl; Pair<int> intPair(2, 3); cout << "Pair of integers: (" << intPair.getFirst() << ", " << intPair.getSecond() << ")" << endl; Pair<double> doublePair(3.14, 2.71); cout << "Pair of doubles: (" << doublePair.getFirst() << ", " << doublePair.getSecond() << ")" << endl; return 0; }