Description:
Sorts list and reports when multiple items have same position in sort order.
<test> binary function name or object, indicating how to compare elements.
<key> binary function name or function object that will be applied to elements.
A function icon or subpatch icon in 'lambda' mode can be connected to <test>
and <key>.
The first output is the sorted list. The second output indicates equal element
(or key) values; for instance, if the second output begins (1 3 ...), then the first
element comes first in the sort order, the next three elements are tied for
second in the sort order, and so on.
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