#include <iostream>
#include <span>

int main() {
    int values[]{2, 4, 6, 8};
    std::span<int> middle{values + 1, 2};
    std::cout << middle.size() << ' ' << middle[0] << ' ' << middle[1] << '\n';
    middle[0] = 9;
    std::cout << values[0] << ' ' << values[1] << ' '
              << values[2] << ' ' << values[3] << '\n';
    return 0;
}