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Images retrieved from:
1. https://developer.squareup.com/blog/so-you-have-some-clusters-now-what/
2. https://subscription.packtpub.com/book/data/9781838821739/10/ch10lvl1sec68/understanding-principal-component-analysis
3. https://liorpachter.wordpress.com/2014/05/26/what-is-principal-component-analysis/
4. https://slideplayer.com/slide/13055479/