ans = []
t = int(input())
for _ in range(t):
    n, x = map(int, input().split())
    # 1 ~ (n - 1)の和
    s = n * (n - 1) // 2
    if x - s < n:
        res = [-1]
    else:
        res = list(range(1, n)) + [x - s]
    ans.append(res)
for an in ans:
    print(*an)