T = int(input())
for _ in range(T):
    N, X = map(int, input().split())
    if N * (N + 1) // 2 > X:
        print(-1)
    else:
        ans = [i + 1 for i in range(N)]
        ans[N - 1] += (X - (N * (N + 1) // 2))
        print(*ans)