t = int(input())

def sygma(s):
    return s * (s + 1) // 2

for i in range(t):
    n, x = map(int, input().split())
    if sygma(n) > x:
        print(-1)
    else:
        ans = list(range(1, n))
        ans.append(x - sygma(n-1))
        print(*ans)