#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;

typedef std::pair<long long, long long> PII;
const int mod = 998244353;
const int N = 2e6 + 1000;
const int INF = 0x3f3f3f3f;
const long long LINF = 1e18;
const double eps = 1e-12;
const double pi = std::acos(-1);
std::mt19937_64 rnd(std::random_device{}());

void solve() {
    int n;
    std::cin >> n;
    if (n == 1 || n % 4 == 0) {
        std::cout << "impossible\n";
        return ;
    }

    for (int i = n - 1; i >= 0; i --) std::cout << i << " ";
    std::cout << "\n";
}

signed main() {
    std::ios::sync_with_stdio(false), std::cin.tie(nullptr), std::cout.tie(nullptr);
    
    int tmp = 1;
    
    std::cin >> tmp;

    while (tmp--)
        solve();

    return 0;
}