A long document I'm working on consists of about 20 chapter files and
contains numerous instances of pieces of text that appear in multiple
location throughout the document. For example, one piece of text appears in 4
different chapters. The document was begun before I joined the project, and
no one bothered to make a list of the pieces of text that appear in multiple
locations, to help manage them efficiently.

Each recurring text is contained within its own section and has its own
heading. I've inserted all the chapter files into one file, and then switched
to Outline view to show the headings only, creating what is essentially a
list of all the headings in the document. At least in principle, now all I
have to do is search through this list and identify those headings that
appear in it more than once. But because this list is more than 30 pages
long, finding all the instances of each recurring heading will be a long,
arduous process.

What is a quick, preferably automated, way to identify each recurring text?
Is there a macro that does this? At a bare minimum, the solution should
identify each heading that appears in the list more than once, and either
mark these headings or create a separate list of them. If I just knew the
title of each heading that recurred, I could search through the list to find
all of the instances of each recurring heading. The ideal, most complete
solution would not only identify those headings that recur, but it would also
show the number and location of the occurences of each recurring heading.

Thanks,
Rob