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Place a mint sprig in each of your 4 glasses and muddle by crushing the mint against the side of the glass with a wooden spoon. Stir together proof rum, lime juice, watermelon juice and simple syrup in a large pitcher, then add watermelon cubes and remaining mint sprigs. Pour rum mixture into glasses. Serve immediately.
**To make simple syrup, combine equal parts sugar and boiling water. Stir until sugar is completely dissolved. Pour into a jar or bottle with a lid, let cool and store in the refrigerator for up to 3 weeks.
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