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#### An Example of If-then-else Format

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

    #ifndef TWO
    The Way that can be told of is not the eternal Way;
    The name that can be named is not the eternal name.
    #endif /* ! TWO */
    The Nameless is the origin of Heaven and Earth;
    #ifndef TWO
    The Named is the mother of all things.
    #else /* TWO */
    The named is the mother of all things.

    #endif /* TWO */
    Therefore let there always be non-being,
      so we may see their subtlety,
    And let there always be being,
      so we may see their outcome.
    The two are the same,
    But after they are produced,
      they have different names.
    #ifdef TWO
    They both may be called deep and profound.
    Deeper and more profound,
    The door of all subtleties!
    #endif /* TWO */