It is not uncommon to use array processing in Jet to do otherwise difficult calculations. The classic example is customers with no sales. Rather than require 3 different lines to accomplish this, why not combine them into a single, compact key word that does everything in 1 line.

The operator Difference, Intersect or Union could be used to separate the 2 sets of data. The basic format would be Filter1 list, Operator, Filter2 list.