Hi,

New to R here.  Lots of fun.  Still rather green though.

I'd like to select unique items from a list that looks like this (for
example):

> xyz
$x
 [1] 8 6 9 0 0 3 9 7 1 9
$y
 [1] 1 2 9 5 1 2 0 9 2 9
$z
 [1] 5 6 9 0 5 1 1 7 3 4

I'd like to select unique (x,y), while preserving association with z
values.  When there are duplicate (x,y) pairs, it doesn't really matter
which (x,y,z) triplet gets preserved - selecting the first would be fine,
but any other way to do it would be fine also.  It /would/ be handy to also
get a list of the rejected triplets, if that's possible.  Ideas?

Thanks!

R

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