20210223 There are many people to thank for sharing these tools, their knowledge, and their encouragement in many different ways. Indeed, the open source and especially the R and now the tidyverse communities are chracterised by their willingness to share for the good of us all, and many folk have also contributed directly and indirectly to this book through their sharing. Their contributions are acknowledged throughout the book, but there are always gaps. To all who share openly, thank you. I have learned so much from this community over more than 30 years.

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