# Author: Maharshi Gor

def read(type=int):
    return type(input())


def read_arr(type=int):
    return [type(token) for token in input().split()]


def foo(n, c, i, r):
    if c < n-1:
        return -1
    if c == (n-1) * n // 2:
        # print('equality')
        for k in range(n):
            A[i + k] = r - k
        return 0
    if c > (n-1) * n // 2:
        return -1
    else:
        A[i + n - 1] = r
        A[i] = r-1
        c -= n - 1
        return foo(n-2, c, i+1, r-2)

t = read()
A = []
for i in range(t):
    n, c = read_arr()
    A = [0] * n
    ret = foo(n, c, 0, n)
    if ret == -1:
        print(-1)
    else:
        for i in range(n):
            print(A[i], end=' ')
        print()