#include <iostream>
#include <string>
#include <vector>

int main() {
    std::vector<std::vector<std::string>> stories;
    stories.push_back({"Once", "upon", "a", "time"});

    for (const auto& x : stories)
        for (const std::string& str : x)
            std::cout << str << ' ';

    return 0;
}