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<?php
  function THEME_preprocess_page(&$vars, $hook) { 
    if (isset($vars['node']->type)) {
      // If the content type's machine name is "my_machine_name"
      //the file name will be "page--my-machine-name.tpl.php".
      $vars['theme_hook_suggestions'][] = 'page__' . $vars['node']->type;
    }
  }
?>