scufl_graph cluster_sources Workflow Inputs cluster_sinks Workflow Outputs Fail_if_false Fail_if_false foo foo Fail_if_false->foo Fail_if_true Fail_if_true bar bar Fail_if_true->bar Echo_list Echo_list foo->Echo_list bar->Echo_list WORKFLOWINTERNALSINK_result result Echo_list->WORKFLOWINTERNALSINK_result WORKFLOWINTERNALSOURCECONTROL WORKFLOWINTERNALSOURCE_condition condition WORKFLOWINTERNALSOURCE_condition->Fail_if_false WORKFLOWINTERNALSOURCE_condition->Fail_if_true WORKFLOWINTERNALSINKCONTROL