i just dont get it
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The zipper itself is made of interlocking teeth – they just barely fit together, but you have to push them really hard.
The slider or zip is shaped like a Y inside – when two sides of the zipper go through it, they get pushed together into the bottom of the Y – this pushes them together and interlocks them, so that you get a nice, tight seal. When you pull the zip back down, they are pulled apart into the two branches of the Y, so they’re forced apart, and the zipper opens.
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