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My girlfriend and I saw a meme on Instagram of a house surrounded by treadmills titled "How to survive the Zombie apocalypse". After seeing it, my girlfriend said "I don't think this would work; they would all stack on one another", and then she asked me whether "they would stack on one another" is correct, and I couldn't answer her question because I got confused myself, being a non-native speaker. I would've said "they would all stack up on top of each other" but I'm not sure....

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They would all stack on top of one another

Nothing you or your girlfriend said is necessarily wrong, but the most idiomatic way to say it would be the above.

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