You are given a positive integer $n$.
In this problem, the $\operatorname{MEX}$ of a collection of integers $c_1,c_2,\dots,c_k$ is defined as the smallest positive integer $x$ which does not occur in the collection $c$.
The primality of an array $a_1,\dots,a_n$ is defined as the number of pairs $(l,r)$ such that $1 \le l \le r \le n$ and $\operatorname{MEX}(a_l,\dots,a_r)$ is a prime number.
Find any permutation of $1,2,\dots,n$ with the maximum possible primality among all permutations of $1,2,\dots,n$.
Note:
- A prime number is a number greater than or equal to
$2$that is not divisible by any positive integer except$1$and itself. For example,$2,5,13$are prime numbers, but$1$and$6$are not prime numbers. - A permutation of
$1,2,\dots,n$is an array consisting of$n$distinct integers from$1$to$n$in arbitrary order. For example,$[2,3,1,5,4]$is a permutation, but$[1,2,2]$is not a permutation ($2$appears twice in the array), and$[1,3,4]$is also not a permutation ($n=3$but there is$4$in the array).
Input
Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 10^4$). The description of the test cases follows.
The only line of each test case contains a single integer $n$ ($1 \le n \le 2 \cdot 10^5$).
It is guaranteed that the sum of $n$ over all test cases does not exceed $2 \cdot 10^5$.
Output
For each test case, output $n$ integers: a permutation of $1,2,\dots,n$ that achieves the maximum possible primality.
If there are multiple solutions, print any of them.
Note
In the first test case, there are $3$ pairs $(l,r)$ with $1 \le l \le r \le 2$, out of which $2$ have a prime $\operatorname{MEX}(a_l,\dots,a_r)$:
$(l,r) = (1,1)$:$\operatorname{MEX}(2) = 1$, which is not prime.$(l,r) = (1,2)$:$\operatorname{MEX}(2,1) = 3$, which is prime.$(l,r) = (2,2)$:$\operatorname{MEX}(1) = 2$, which is prime.
Therefore, the primality is $2$.
In the second test case, $\operatorname{MEX}(1) = 2$ is prime, so the primality is $1$.
In the third test case, the maximum possible primality is $8$.
样例
3
2
1
5
2 1
1
5 2 1 4 3
题面与样例版权归 Codeforces 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。