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All three pitches sound legal to me. The pitch starts when the pitcher breaks her hands. From that point she is allowed to drop her pitching hand down and to the rear, then deliver the ball directly to the batter (the slingshot method) or after 1 revolution (the windmill method). The delivery must be accompanied by a single step with the non-pivot foot and the step must be forward.
BTW, the pitcher is not limited to one pitching style and can intermix the slingshot and the windmill deliveries between pitches.
SamC
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