T = int(input())

for t in range(T):
    N, X = map(int, input().split())
    summ_until_final2 = (N) * (N - 1) // 2
    if (summ_until_final2 + N > X):
        print(-1)
    else:
        
        print(*([i+1 for i in range(N-1)] + [X - summ_until_final2]))