For all of the duplicates in x, return the indices for each of these duplicates.
logical: ignored in this version
a list with each element corresponding to a duplicate entry in x. The value of each element is the numerical indices into x where this duplicate appeared. The name of each element is the duplicate name.
sort x so that you only need to do a local search for duplicates, not a global search.
Mark Cowley, 20 March 2007
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