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##### An Example of Unified Format

Here is the output of the command `diff -u lao tzu` (see Sample diff Input, for the complete contents of the two files):

    --- lao	2002-02-21 23:30:39.942229878 -0800
    +++ tzu	2002-02-21 23:30:50.442260588 -0800
    @@ -1,7 +1,6 @@
    -The Way that can be told of is not the eternal Way;
    -The name that can be named is not the eternal name.
     The Nameless is the origin of Heaven and Earth;
    -The Named is the mother of all things.
    +The named is the mother of all things.
    +
     Therefore let there always be non-being,
       so we may see their subtlety,
     And let there always be being,
    @@ -9,3 +8,6 @@
     The two are the same,
     But after they are produced,
       they have different names.
    +They both may be called deep and profound.
    +Deeper and more profound,
    +The door of all subtleties!