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Returns the intersection of two input sets, optionally retaining duplicates.


Intersect(«Set1», «Set2»[, ALL])


This function returns the intersection of «Set1» and «Set2». By default, duplicates are eliminated from both sets prior to intersection.

The optional ALL retains duplicates. There are several ways for ALL to work. The algorithm is: Nonduplicated elements are intersected as usual. For each duplicate in «Set1», match it with a duplicate in «Set2», if one exists, and keep matching duplicates in the intersected set.


This example

Intersect({[1994], [1995], [1996]}, {[1995], [1996], [1997]})

returns the set {[1995], [1996]}.