Add a diff utility written in Python

[sandbox] / diff / before.txt

diff --git a/diff/before.txt b/diff/before.txt
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+This part of the
+document has stayed the
+same from version to
+version.  It shouldn't
+be shown if it doesn't
+change.  Otherwise, that
+would not be helping to
+compress the size of the
+changes.
+
+This paragraph contains
+text that is outdated.
+It will be deleted in the
+near future.
+
+It is important to spell
+check this dokument. On
+the other hand, a
+misspelled word isn't
+the end of the world.
+Nothing in the rest of
+this paragraph needs to
+be changed. Things can
+be added after it.