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diff --git a/xv6-rev2.tar.gz b/xv6-rev2.tar.gz
new file mode 100644
index 0000000..f535652
--- /dev/null
+++ b/xv6-rev2.tar.gz
diff --git a/xv6.pdf b/xv6.pdf
index d6defdb..cf2e59c 100644
--- a/xv6.pdf
+++ b/xv6.pdf