1: "In twenty-one seconds, one person out of twenty can find the eaten apple."
2: "How fast can you spot the missing apple in a group of twenty?"
3: "The challenge of finding the eaten apple in just twenty-one seconds."
4: "Test your visual skills with this quick apple search."
5: "Discover the science behind the twenty-one-second apple challenge."
6: "Why is it so difficult to find the eaten apple among the rest?"
7: "Improve your attention to detail with the apple search task."
8: "Train your brain with the fast-paced apple spotting game."
9: "Challenge yourself to beat the twenty-one-second apple hunt record."
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