cheatsheet:
https://www.rstudio.com/wp-content/uploads/2015/02/data-wrangling-cheatsheet.pdf
do domu:
http://enwo.pl/przetwarzanie/dplyr-czesc-ii.html
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… it is clear that Earth's climate system has proven itself to be an angry beast. When nudged, it is capable of a violent response – Wallace Broecker
