#include <iostream>
#include <vector>
#include <utility>
#include <string>
using namespace std;
int main()
{
using Pair_str = pair<string, string>;
vector<Pair_str> v1 = {
{"Hello ", "world!"},
{"Bye ", "world!" }
};
using Vec_str = vector<string>;
vector<Vec_str> v2 = {
{"1", "2", "3"},
{"q", "w", "e", "r", "t", "y"}
};
}
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