def dump_args_json( args_json ):
    """
    Diagnostic dump of args_json dictionary.
    """
    print('dump args json dictionary keys level 1')
    for dict_key in args_json.keys():
      print( 'dict_key: %s' % (dict_key))
  
    print('dump args json dictionary keys level 2 (runs)')
    for sample in args_json['samples']:
      print('sample: %s' % (sample))
    return( 0 )