Combined Filters Neighbors Front Sums The Neighbors Front Sums (NB-FS) 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 Front 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. The is the first digit of that sum. If the sum is only one digit the Front Sums filter returns 0. To show you how to calculate the Neighbors Front Sums filter select one of the links below for a step by step example.
Neighbors Front Sums
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