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zero is pretty easy to get to [by subtaction]. you can even explain it to a pre-pythagorean "caveman".
hand the cave man an arbritrary number of stones/twigs/oranges. keep the number low to keep it simple. ask the caveman how many he has. then (assuming he's correct) take the same number of stones/twigs/oranges from him and ask him again.
viola.
(disclaimer. a clever caveman when asked the second time how many stones/twigs/oranges he has may respond "but i dont have any")
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