Problem: Lunar rover finally reached planet X. After landing, he met an obstacle, that contains permutation p of length n. Scientists found out, that to overcome an obstacle, the robot should make p an identity permutation (make p_i = i for all i).

Unfortunately, scientists can't control the robot. Thus the only way to make p an identity permutation is applying the following operation to p multiple times: 

  * Select two indices i and j (i ≠ j), such that p_j = i and swap the values of p_i and p_j. It takes robot (j - i)^2 seconds to do this operation. 

Positions i and j are selected by the robot (scientists can't control it). He will apply this operation while p isn't an identity permutation. We can show that the robot will make no more than n operations regardless of the choice of i and j on each operation.

Scientists asked you to find out the maximum possible time it will take the robot to finish making p an identity permutation (i. e. worst-case scenario), so they can decide whether they should construct a new lunar rover or just rest and wait. They won't believe you without proof, so you should build an example of p and robot's operations that maximizes the answer.

For a better understanding of the statement, read the sample description.

Input

The first line of input contains a single integer t (1 ≤ t ≤ 10^4) — the number of test cases.

Each of next t lines contains the single integer n (2 ≤ n ≤ 10^5) – the length of p.

Note, that p is not given to you. You should find the maximum possible time over all permutations of length n.

It is guaranteed, that the total sum of n over all test cases doesn't exceed 10^5.

Output

For each test case in the first line, print how many seconds will the robot spend in the worst case.

In the next line, print the initial value of p that you used to construct an answer.

In the next line, print the number of operations m ≤ n that the robot makes in your example.

In the each of next m lines print two integers i and j — indices of positions that the robot will swap on this operation. Note that p_j = i must holds (at the time of operation).

Example

Input


3
2
3
3


Output


1
2 1
1
2 1
5
2 3 1
2
1 3
3 2
5
2 3 1
2
1 3
2 3

Note

For n = 2, p can be either [1, 2] or [2, 1]. In the first case p is already identity, otherwise robot will make it an identity permutation in 1 second regardless of choise i and j on the first operation.

For n = 3, p can be equals [2, 3, 1].

  * If robot will select i = 3, j = 2 on the first operation, p will become [2, 1, 3] in one second. Now robot can select only i = 1, j = 2 or i = 2, j = 1. In both cases, p will become identity in one more second (2 seconds in total).
  * If robot will select i = 1, j = 3 on the first operation, p will become [1, 3, 2] in four seconds. Regardless of choise of i and j on the second operation, p will become identity in five seconds. 



We can show, that for permutation of length 3 robot will always finish all operation in no more than 5 seconds.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>

using namespace std;

void solve()
{
    int n;
    cin >> n;

    if (n == 1)
    {
        cout << 0 << "\n";
        cout << 1 << "\n";
        cout << 0 << "\n";
        return;
    }

    long long ans = 0;
    long long cnt = 1, st = n - 1, asz = 0;
    while (asz < n - 1)
    {
        if (cnt == 0)
        {
            cnt = 2;
            st--;
        }
        ans += st * st;
        cnt--;
        asz++;
    }
    cout << ans << "\n";

    vector<int> p;
    vector<int> opi, opj;

    {
        p.push_back(n / 2 + 1);
        for (int i = 1; i < n / 2; i++)
        {
            p.push_back(i);
        }
        for (int i = n / 2 + 2; i <= n; i++)
        {
            p.push_back(i);
        }
        p.push_back(n / 2);
        for (int i = n / 2 + 1; i < n; i++)
        {
            opi.push_back(i);
            opj.push_back(1);
        }
        for (int i = n / 2; i > 1; i--)
        {
            opi.push_back(i);
            opj.push_back(n);
        }
        if (n != 1)
        {
            opi.push_back(1);
            opj.push_back(n);
        }
    }

    for (int i = 0; i < p.size(); i++)
    {
        cout << p[i] << " ";
    }
    cout << "\n";
    cout << opi.size() << "\n";
    for (int j = 0; j < opi.size(); j++)
    {
        cout << opi[j] << " " << opj[j] << "\n";
    }
    cout << "\n";
    return;

    long long tm = 0;
    for (int j = 0; j < opi.size(); j++)
    {
        opi[j]--;
        opj[j]--;
        assert(p[opj[j]] - 1 == opi[j]);
        swap(p[opi[j]], p[opj[j]]);
        tm += 1ll * (opi[j] - opj[j]) * (opi[j] - opj[j]);
    }
    //cout << "True time = " << tm << "\n";
    //cout << "Resulting permutation = ";
    for (int i = 0; i < n; i++)
    {
        ;//cout << p[i] << " ";
    }
    //cout << "\n";

    assert(tm == ans);
    for (int i = 0; i < n; i++)
    {
        assert(p[i] == i + 1);
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t;
    cin >> t;
    while (t--)
    {
        solve();
    }
}