#include <iostream>
#include <stdio.h>
using namespace std;
int main () {
ios_base::sync_with_stdio(true);
cin.tie(NULL);
for (int i = 0; i < 3; i++) {
cout << i << " ";
cout.flush(); // <<<<<<<<<<
printf("%d ", i);
}
cout << endl;
return 0;
}
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