Jarvis1: A Three-Number Spiral Dozens System

Procedure: Note the two-number combinations below.

*These numbers are interchangeable.

First Dozen:  1,12     2,11     3,10     4,9     6,7     5,8

Second Dozen:  13,24     14,23     15,22     16,21     18,19     17,20

Third Dozen:  25,36     26...

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