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So if you have an odd number of heads up coins you need to flip one coin over.
If you flipped a heads up coin over you now have one fewer heads up coin, so an even number of heads up coins.
However, if you flipped a tails up coin over you will now have one more heads up coin, so an even number of heads up coins.
Like issy, now I'm stuck getting an equal number of heads up coins into two stacks.
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