T = int(input())

for _ in range(T):
    N, X = map(int, input().split())

    S = N * (N + 1) // 2
    if X < S:
        print(-1)
    else:
        ans = list(range(1, N + 1))
        ans[-1] += X - S
        print(" ".join(list(map(str, ans))))