Like those toddlers who get stuck in a fence or alikes. How can they put their head in but once it’s past it’s impossible to get it out again. Or even a ring, a couple of minutes after putting it in it’s harder to get it out
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It depends. An opposite example is a hose. It’s really hard to push a hose into a hole, because the harder you push it the thicker it gets. When you pull on it, it gets thinner and comes out much easier.
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