This template will print the numbers in the files x and y in whatever directory it is in,
for instance,
if rendered as render_template("example_chdir.Rmd", output="a/sum.html", change.rootdir=TRUE),
and there are files a/x and a/y, the numbers in those files should appear below.
x <- scan('x') y <- scan('y')
In this directory, $x=r x$ and $y=r y$, so $x+y=r x+y$.
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