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Tutorial mode ------------- If you're interested in the tutorial version of this repository, see the "tutorial2" (POPL'13) or "tutorial" (RacketCon'12) branch in the git repository. Normal mode ----------- If you're using Racket v22.214.171.124 or later, use raco pkg install scratchy to download and install the "scratchy" package and collection. For earlier versions, install this directory as a Racket collection "scratchy", perhaps by running raco link scratchy raco setup scratchy scribblings/main in the directory directory containing this "README.txt" (as opposed to the parent directory of this one).