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;
typedef long long ll;
int n,T,cnt;
char s[100005];
int a[100005];
pair<int,int> all[200005];
int main()
{
	scanf("%d",&T);
	while(T--)
	{
		scanf("%d",&n);
		cnt=0;
		for(int i=1;i<=n;i++) a[i]=i;
		ll ans=1ll*(n-1)*(n-1);
		for(int i=n-2;i>=n/2;i--) ans+=2ll*i*i;
		if(n&1) ans-=1ll*(n/2)*(n/2);
		printf("%lld\n",ans);
		swap(a[1],a[n]);
		all[++cnt]=make_pair(n,1);
		for(int i=2;i<=n/2;i++)
		{
			swap(a[n-i+1],a[1]);
			all[++cnt]=make_pair(1,n-i+1);
			swap(a[i],a[n]);
			all[++cnt]=make_pair(n,i);
		}
		if(n&1) swap(a[n/2+1],a[1]),all[++cnt]=make_pair(1,n/2+1);
		for(int i=1;i<=n;i++) 
		{
			if(i<n) printf("%d ",a[i]);
			else printf("%d\n",a[i]);
		}
		printf("%d\n",n-1);
		for(int i=cnt;i>=1;i--)
		{
			printf("%d %d\n",all[i].second,all[i].first);
		}
	}
	return 0;
}