#include <iostream>
using namespace std;
int main() {
int a[7];
a[0] = 1; a[1] = 2; a[2] = 3; a[3] = 4; a[4] = 5; a[5] = 6; a[6] = 3;
char z[7] = {0};
for (int i=0; i < 7;z[i]++,z[i]<3?i=a[i]:i++)
if (z[i] > 0) cout << (z[i]>1? "\n":to_string(i) + " ");
return 0;
}
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