Combined Filters Neighbors Sums The Neighbors Sums (NB-SUM) is a so called "combined filter", a combination of two filters:
Neighbors (NB) is yet another alternative to the old VTracs (VTX). Instead of combining digits by adding 5 it selects the all even digits with the next odd digit up, 0 with 1, 2 with 3 all the way to 8 with 9. It is another efficient way to combine an odd with an even digit. The Sums filter is a so called "math filter". Math filters are created through calculations. You get the sum of a number by adding up the digits within that number. To show you how to calculate the Neighbors Sums filter select one of the links below for a step by step example.
Neighbors Sums
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