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Apr 15, 2011 at 6:19 comment added Michael Bächtold You're welcome! I'll try to explain how i though of point 3 as soon as I have a moment.
Apr 14, 2011 at 20:59 vote accept agt
Apr 14, 2011 at 20:59 comment added agt Dear Michael, Thank you very much. Your answer is very enlightening and properly what I was searching for. I have tried to read it careful. In order to express you my appreciation I have posted an answer in which I write what I have understood with just a slight modification about your condition 3.
Apr 14, 2011 at 18:19 history edited Michael Bächtold CC BY-SA 3.0
minor improvements
Apr 14, 2011 at 16:07 history answered Michael Bächtold CC BY-SA 3.0