#include <string>
#include <list>
#include<iostream>
using namespace std;
int main(int argc, const char * argv[])
{
list<int> l{1,2,3,4};
list<list<int>> ll;
ll.push_back(l);
for(auto x:ll)
for(auto y:x)
std::cout<< y << " ";
std::cout << "\nSize :" << ll.size();
return 0;
}
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