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From what I have been able to learn from experience, but mostly from talking to others, this mechanic is definitely a "by regional adoption" one. There are even variations within my state. The area where I officiated the past few years doesn't use it very much, but the area I'm going to be working in this season supposedly uses it much more.
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"It is not enough to do your best; you must know what to do, and then do your best." - W. Edwards Deming
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