#include <array>
#include <iostream>
#include <span>

int main() {
    std::array<int, 3> owner{2, 4, 6};
    {
        std::span<int> view{owner};
        view[1] = 9;
        std::cout << view[1] << '\n';
    }
    std::cout << owner[1] << '\n';
    const std::span<const int> again{owner};
    std::cout << again.size() << ' ' << again[0] << '\n';
    return 0;
}