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Once upon a time, there was an old oak tree on the edge of the forest. Every autumn, this oak tree would lay hundreds of acorns from its branches in the ground. One of these acorns was very different from the others. His name was Palu, and on his head was a tiny, but sturdy, hat that looked like a mushroom. While the other acorns wanted to roll and disappear into the ground, Palu had another dream: to grow into something useful!