<el x='2' y='3'/> and
<el x='2' y='4'/>
are they classed as duplicate members
of this population?
No, even if they the same y attribute.
A set of sequences.
A set.
But a set does not contain duplicates?
I suspect me droning on about set theory has made you paranoid.
You are partitioning the original sequence so every item has a
distinguishing property (its position in the original sequence)
so there are no duplicates.
David
(I think)
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