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  • $\begingroup$ Good idea to use Hold (+1). My answer is more boring and I don't actually have a way to test it... $\endgroup$ Commented Dec 6, 2012 at 0:37
  • $\begingroup$ @Jens Thanks! The basic idea came pretty soon, but it took quite a bit of fiddling before it all worked. Afterwards it looks so simple. $\endgroup$ Commented Dec 6, 2012 at 0:43