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16 points

It’s an engine with a single large piston, and combustion occurs each time it jumps.

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26 points

no it’s a thingamabob. it is powered by a whatsit that turns a gizmo that makes the plunger plung.

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11 points

Finally, someone who understands science

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8 points

Good ol’ ground compactor, I think, though I think they usually have a higher frequency than that.

Might be because he isn’t controlling it.

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