no more acorns, please?

I'm not sure why it took me four years to notice this, but we have an acorn tree in our back ally.
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It produces lots and lots of acorns every fall.
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This year, the girls and their friends decided to start collecting them in order to make necklaces.
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I'll be really impressed if they actually complete one! The process is quite lengthy. First you have to remove the ends of the acorn by rubbing for a looonnng time.
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Ten minutes later you get something that looks like this:
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Next, you use a toothpick to poke out the fleshy part of the nut.  It's sort of yellowish and grainy in texture.
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Then, you finally end up with a hollow acorn shell.
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Just repeat the process about 10 times...and maybe the girls will have a necklace or bracelet.
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I wonder what else we could do with these acorns?