Hoofdstuk 1: Het microbioom

https://github.com/simonask/w/issues/20
https://github.com/selfteaching/the-craft-of-selfteaching/issues/1217
https://github.com/youranreus/G/issues/131

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https://glot.io/snippets/h6p2j8vd9g
https://github.com/Yalantis/uCrop/issues/948

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