def solve_one():
    N, X = map(int, input().split())
    if X < N * (N + 1) // 2:
        print(-1)
        return
    else:
        print(*range(1, N), X - N * (N - 1) // 2)
            

if __name__ == "__main__":
    T = int(input())
    for i in range(1, T + 1):
        solve_one()