code: def expand_valid_values(valid_values):
          
  
          if '${GROUP_TYPES}' in valid_values:
              valid_values.remove('${GROUP_TYPES}')
              valid_values.extend(
                  [
                      'Adversary',
                      'Campaign',
                      'Document',
                      'Email',
                      'Event',
                      'Incident',
                      'Intrusion Set',
                      'Signature',
                      'Task',
                      'Threat',
                  ]
              )
          elif '${OWNERS}' in valid_values:
              valid_values.remove('${OWNERS}')
              valid_values.append('')
          elif '${USERS}' in valid_values:
              valid_values.remove('${USERS}')
              valid_values.append('')
          return valid_values
docs: Expand supported playbook variables to their full list.
  
          Args:
              valid_values (list): The list of valid values for Choice or MultiChoice inputs.
  
          Returns:
              List: An expanded list of valid values for Choice or MultiChoice inputs.