T = int(input())

# 1以上n以下の整数の総和
def sigma(num):
    return num * (num + 1) // 2

for _ in range(T):
    N, X = map(int, input().split())
    if sigma(N) > X:
        print(-1)
    else:
        ans = list(range(1, N))
        ans.append(X - sigma(N-1))
        print(*ans)