This post answers the questions
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Why is my zip file still too big?
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What Is a ZIP File?
How to reduce Zip file size - Quora
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How to reduce Zip file size - Quora
What Is a ZIP File?
Compressor — Blog
Even though I zipped a folder, folder size remains the same. Is there any way to reduce folder size after zipping? - Quora
Mastering 7-Zip: Compress and archive files like a pro! — RapidSeedbox
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