i just dont get it
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Picture a stack of coffee mugs all tied together by a rope through their handles. The distance from the top of one mug to the bottom of the other is a little less than the height of the mugs themselves. Now we take the rope and bend it back so the mugs are on the outside of the curve. This spaces the mugs out and gives us the space to slide a different strand of mugs between the other strand. Once the ropes are straightened out the two separate strands of mugs are firmly held together as if they were stacked.
A zipper works much the same way with the slider (the thing you move) behind the two strands of teeth away from each other and lining them up to be gently pushed together on the bottom end of the slider.
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