#include <iostream>
 
using namespace std;
 
int main()
{
    int t, n;
    int   tab[101];
    int k =0;
 
    cin >> t;
    for(int i = 0; i < t; i++)
    {
        int x =0;
        while(cin >> n && n <=100)
        {
            tab[x] = n;
 
            x++;
            k =x;
        }
 
        for (int i = 2; i < k ;)
        {
            cout << tab[i] << " " ;
            i +=2;
 
        }
 
        for (int i = 1; i < k ;)
        {
            cout << tab[i] << " " ;
            i +=2;
        }
        cout << endl;
 
 
    }
 
    return 0;
}
 

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