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we'll orient things from Serena's point of view,
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and if she hits right that means
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she's attempting to pass Serena on Serena's right.
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If Serena chooses L that means
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she cheats slightly towards her left:
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not cheats in the sense of breaking the rules,
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but cheats in terms of where she's standing or leaning.
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And if she chooses right that
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means she cheats slightly towards her right.
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So this is cheating towards her backhand
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and this is cheating towards her forehand,
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assuming she's right handed, which she in fact is.