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1018 - 818 is 19.
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Related: 20/18-8/18 10/18-16/18 10/36-8/18 10/18-8/36 30/18-8/18 10/18-24/18 10/54-8/18 10/18-8/54 50/18-8/18 10/18-40/18 10/90-8/18 10/18-8/90 70/18-8/18 10/18-56/18
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