Thank you very much, hexcoder, for these very useful links on a debugging technique that I did not know so far and can save tremendous amount of debugging time. I for sure will be using it all the time from now on. I wish I could upvote your post more than once.

In reply to Re^2: Can you tell me why I get this error and if I can optimize my code somehow? by Laurent_R
in thread Can you tell me why I get this error and if I can optimize my code somehow? by Anonymous Monk

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