t = int(input())

for i in range(t):
    n, x = map(int,input().split())
    if x-(n*(n-1) //2)  < n:
        print(-1)
        continue
    else:
        if n > 1:
            for j in range(1,n):
                print(j,end=" ")
            print(x-(j*(j+1))//2)
        else:
            print(x)