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With the ``-r`` option, the tree is compared to an earlier revision, or
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the differences between two versions are shown::
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To see the changes introduced by a single revision, you can use the ``-c``
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# identical to -r999..1000
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passing options. For example::
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Some projects prefer patches to show a prefix at the start of the path
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for old and new files. The ``--prefix`` option can be used to provide