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+
+## simple
+
+This is a simple (but not the simplest possible) dat archive: a single short
+README file, which is added in one version and modified in the second (to
+include a self-reference to the dat address).
+
+## alphabet
+
+This dat archive is intended to match the content tree examples from the
+`hypercore` registry.
+
+To generate single-character files with no trailing newline:
+
+    echo -n 'a' > a
+    echo -n 'b' > b
+    echo -n 'c' > c
+    echo -n 'd' > d
+    echo -n 'e' > e
+    echo -n 'f' > f
+
+## tree
+
+This archive has a bunch of deeply nested folders, to demonstrate hyperdrive
+lookup behavior.