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Take another look at the video in Twisting and Turning.
Can you spot the strategy they used to get back to $0$?
Here is an interactive tool you can use to try out some strategies.
More Twisting and Turning
Age 11 to 16
Challenge Level 
Take another look at the video in Twisting and Turning.
Can you spot the strategy they used to get back to $0$?
Here is an interactive tool you can use to try out some strategies.
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