T = int(input())
for i in range(T):
    N,X = map(int,input().split())
    ans = []
    for i in range(N-1):
        ans.append(i+1)
        X -= i+1
    if (len(ans) > 0 and ans[-1] < X) or len(ans) == 0:
        ans.append(X)
        print(*ans)
    else:
        print(-1)