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19 Things You Didn’t Know The Purpose Of

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Image source: pexels

2. The shape of a diamond on your backpack

This small diamond allows you to tie something to a backpack  like your shoes  so that your hands remain free for other purposes.

1. Padlock holes

The small hole in a padlock lets water seep from it in exterior settings. That way, the lock won’t freeze in the winter or rust after rainfall.

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