T = int(input())

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