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The RD is a machine that helps astronauts role on the ground.It will help u to drive on the rocks and keep u safe without falling off.It can go over hard area and u cant fall off.By leaning forward u activate it and then u can lean back in a position and it will go to where u leaned to.If u wanted something that will go easily over areas that are tough to drive over u can use the Rd.If u don't feel like riding in a car u can use the Rd and it will help u drive over these areas.It is easy to control and it doesn't take much to turn it on.It runs on air so it wont be that bad to use u can use it to save energy.
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