How to use the flexget.plugin.register function in FlexGet

def register_plugin():
    plugin.register(OutputRapidPush, 'rapidpush', api_ver=2)

def register_plugin():
    plugin.register(NotifyEntry, 'notify_entry', api_ver=2)

def register_plugin():
    plugin.register(MetainfoContentSize, 'metainfo_content_size', builtin=True, api_ver=2)

def register_plugin():
    plugin.register(Listdir, 'listdir', api_ver=2)

def register_plugin():
    plugin.register(Duplicates, 'duplicates', api_ver=2)

def register_plugin():
    plugin.register(ModifySet, 'set', api_ver=2)

def register_plugin():
    plugin.register(TraktAdd, 'trakt_add', api_ver=2)
    plugin.register(TraktRemove, 'trakt_remove', api_ver=2)

def register_plugin():
    plugin.register(DeleteFiles, 'delete', api_ver=2)
    plugin.register(CopyFiles, 'copy', api_ver=2)
    plugin.register(MoveFiles, 'move', api_ver=2)

def register_plugin():
    plugin.register(PluginHeaders, 'headers', api_ver=2)

def register_plugin():
    plugin.register(NewTorrents, 'newtorrents', interfaces=['urlrewriter', 'search'], api_ver=2)