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    package My::Hadoop::Example::Wordcount;
    use Moose::Role;
...
    with Hadoop::Streaming::Reducer,  My::Hadoop::Example::Wordcount;

    1;

  #!/usr/bin/perl
  use My::Hadoop::Example;
  My::Hadoop::Example::Mapper->run();

  #!/usr/bin/perl
  use My::Hadoop::Example;
  My::Hadoop::Example::Combiner->run();

  #!/usr/bin/perl
  use My::Hadoop::Example;
  My::Hadoop::Example::Reducer->run();

  hadoop                                     \
      jar $streaming_jar_name                \
...
      -mapper   my_mapper                    \
      -combiner my_combiner                  \
      -reducer  my_reducer