Alternating Even-Odd Sequence Generator

You are given a positive integer n. Your task is to generate a sequence of n distinct integers by selecting numbers from the set \(\{1,2,\dots,2n\}\) such that the sequence alternates between even and odd numbers, starting with an even number.

More formally, let the sequence be \(a_1, a_2, \dots, a_n\), then:

• \(a_1\) is even,
• \(a_2\) is odd,
• \(a_3\) is even,
• and so on.

Each number must be unique and chosen from \(\{1,2,\dots,2n\}\). For instance, when \(n = 3\), one valid sequence is 2 1 4.

inputFormat

The input is given via standard input (stdin) and is formatted as follows:

T
n1
n2
... 
 nT

Here, the first line contains a single integer T denoting the number of test cases. Each of the following T lines contains a single integer n representing the length of the sequence to be generated.

outputFormat

For each test case, output a single line containing the generated sequence. The numbers in the sequence should be separated by a single space. The output should be written to the standard output (stdout).

For example, if the test case is 3, then a valid output would be: 2 1 4

## sample

1
3

2 1 4