<vertical display_name="Electric Circuit Simulator">
  <html url_name="d5a5caaf35e84ebc9a747038465dcfb4"/>
  <problem url_name="free_form_simulation"/>
  <problem url_name="logic_gate_problem"/>
  <discussion url_name="4f06b358a96f4d1dae57d6d81acd06f2"/>
</vertical>