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I looked up Sit 5 from 2005 Interps, as far as I know, the only mention of "gorilla". The Sit said swinging the arm back and forth is illegal. A pitcher must have his hand behind his back or by his side (6-1-3).
The 2010 rules powerpoint illlustrates that holding the hand in front of the body is legal. It's the swinging back and forth that is interpreted as illegal.
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