#include <bits/stdc++.h>
using namespace std;

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        for (int i = 1; i < n; i+=2)
        {
            cout << i + 1 << " " << i << " ";
        }
        cout << endl;
    }
}