is pop-uping by Mathoverflow quite often (by the way what is criteria for pop-up ?).
I do not think it is that much interesting question to be so much pop-uped. On the other hand there is no answer which is satisfactory for me, but I am afraid may be it is a little chance to get it (in part may be question is not so good).
So I would prefer this question not to be pop-uped, but without accepting answer.
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There is simple way I can do by myself - just write something like that in the answer and accept it, but may be there is more canonical way ?