Automate image layout for comparison

For a project I'm working on I needed to compare three figures each for about 50 countries. Printing 150 images seemed like a waste (especially as I would need to print the images single–sided) and open three images to view on screen 150 times was likely to result in me opening the wrong image at least once. My solution was to group the three images for each country onto one image for me to easily compare, and print if necessary.

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