A15304. Even-Odd XOR

Given an integer $n$ , find any array $a$ of $n$ distinct nonnegative integers less than $2^{31}$ such that the [bitwise XOR](https://en.wikipedia.org/wiki/Bitwise_operation#XOR) of the elements on odd indices equals the bitwise XOR of the elements on even indices.

The first line of the input contains an integer $t$ ( $1 \leq t \leq 629$ ) — the number of test cases.

Then $t$ lines follow, each containing a single integer $n$ $(3 \leq n \leq 2\cdot10^5)$ — the length of the array.

It is guaranteed that the sum of $n$ over all test cases does not exceed $2\cdot 10^5$ .

For each test case, output one line containing $n$ distinct integers that satisfy the conditions.

If there are multiple answers, you can output any of them.

In the first test case the XOR on odd indices is $4 \oplus 1 \oplus 0 \oplus 7 = 2$ and the XOR on even indices is $2 \oplus 5 \oplus 6 \oplus 3= 2$ .