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Hello. This is a helicopter and this is a crane.

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It uses this for carrying things and this for transporting people.

3
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It uses energy from people.

4
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This is energy from people.

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This is how these machines work.

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The helicopter has a motor of a rubber and it has a hook that is hooked to the propeller

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at the same time that it is hooked to the rubber.

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And when I turn this, the hook turns and the rubber rolls.

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And then, when I release the propeller, it will rotate due to the energy of the rubber.

10
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And that's it.

11
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And this one, which is the crane, has a thread that is hooked, I hook it again, and it has some sticks here, the ones that hold the rope, and these are glued, but nevertheless, this one does not, because that is the one that has to turn.

12
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and then when I turn the crank it goes up and the same with weight I have here a bag with

13
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and when I put them on and I throw them up, it goes up and down, thanks to the sticks and the water.

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Bye!