package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var t int
	fmt.Fscan(reader, &t)

	for i := 0; i < t; i++ {
		var n, k int
		fmt.Fscan(reader, &n, &k)

		if k > (n-1)/2 {
			fmt.Fprintln(writer, -1)
			continue
		}

		ans := make([]int, n)
		for j := 0; j < n; j++ {
			ans[j] = j + 1
		}

		for j := 0; j < k; j++ {
			ans[2*j+1], ans[2*j+2] = ans[2*j+2], ans[2*j+1]
		}

		for j := 0; j < n; j++ {
			if j > 0 {
				fmt.Fprint(writer, " ")
			}
			fmt.Fprint(writer, ans[j])
		}
		fmt.Fprintln(writer)
	}
}