That's not really important, now that the issue is solved. However, that substring does indeed appear twise. I don't know if your browser works like mine, but if it does, then the substring you refer to occurs in the third line of the big string I posted, and the second occurance is in the 7th and 8th lines (my browser prints a + sign at every linebreak. Maybe that's what confused you).
Again, thank you all Monks for your time and help.
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