Searches groups of species containing
* the same value or
* identical words in values
in the field selected at 'Search field' of the first query.
All duplicated occurrences are added to the hitlist - first occurrence gets '1st' added,
following occurrences get 'dup' added.
The first occurrence is NOT marked, all following occurrences get marked - so you can easily
perform some action on duplicates.
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