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  • Could you describe the meaning of the output numbers? The left column is presumably the number of parentheses that are more than 1 layer deep - is the right column simply the current line number? Commented Aug 19, 2016 at 22:15
  • That's right @JigglyNaga, in this example the number of occurrences is the first column and the line number is the second column; although the format is not important actually. Commented Aug 19, 2016 at 22:24