package main

import . "fmt"
import . "os"
import "bufio"

func main() {
	wr:=bufio.NewWriter(Stdout)
	var t int
	Scan(&t)
	for ; t>0; t-- {
		var n,x int64
		Scan(&n,&x)
		c:=x-x
		z:=[]int64{}
		for i:=n/n;i<n;i++ {
			c+=i
			z=append(z,i)
		}
		if x-c<n {
			Fprintln(wr,-1)
			continue
		}
		z=append(z,x-c)
		for i,v:=range z {
			if i>0 {
				Fprint(wr," ")
			}
			Fprint(wr,v)
		}
		Fprintln(wr)
	}
	wr.Flush()
}