def solve_one():
    N, X = map(int, input().split())
    mi = N * (N + 1) // 2
    if X < mi:
        print(-1)
        return
    ans = []
    s = 0
    prev_hi = X + 1
    for i in range(N):
        rest = N - i
        lo, hi = N - i - 1, prev_hi - 1
        while lo + 1 < hi:
            mi = (lo + hi) // 2
            t = (mi + (mi - rest + 1)) * rest // 2
            if s + t >= X:
                hi = mi
            else:
                lo = mi
        ans.append(hi)
        prev_hi = hi
        s += hi
    print(*ans)
            

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