[GiNaC-list] same expression prints in differs orders

[Jose Antonio Garcia Peiro]

Hi,
I am try to test expressions with "match", but it not works
always with the same expression. I think that the problem
is at internal representation or at internal order. When
I debug the code, same expression prints differ.
ex test = pow(log(x),2)/x;
cout << test;
// sometimes x^(-1)*log(x)^2
// other sometimes log(x)^2*x^(-1)

How I can force GiNaC to unique representation?

thanks
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