"Each castaway will have their memory tested with this challenge. Scattered in the arena are pairs of matching symbols. Each round the duelers will flip over two symbols. If the two symbols match, the duelers score a point. First person to score five points stays alive in the game." ~ @SurvivorWiki
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Casey and William compete.
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Casey wins the duel and remains on redemption island.
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William leaves the game.
Proceed to the immunity challenge.