Ultimately i am trying to check if the items in $s1 can also be found in $s2.
For example -
as these are both subsets of the same set of nodes you presumably mean
node identity here rather than value equality. You don't need any loops
at all for that
count($s1|$s2)=count($s2)
is true just if all the items in s1 are in s2.
David
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