code: def DisplayAccountTree(account, accounts, links, depth=0):
    
    prefix = '-' * depth * 2
    print '%s%s, %s' % (prefix, account['customerId'], account['name'])
    if account['customerId'] in links:
      for child_link in links[account['customerId']]:
        child_account = accounts[child_link['clientCustomerId']]
        DisplayAccountTree(child_account, accounts, links, depth + 1)
docs: Displays an account tree.
  
    Args:
      account: dict The account to display.
      accounts: dict Map from customerId to account.
      links: dict Map from customerId to child links.
      depth: int Depth of the current account in the tree.