code: def get_all_lanes(self):
          
  
          done = set()
          lanes = set()
  
          def recursive_find(task_spec):
              if task_spec in done:
                  return
  
              done.add(task_spec)
  
              if hasattr(task_spec, 'lane') and task_spec.lane:
                  lanes.add(task_spec.lane)
  
              if hasattr(task_spec, 'spec'):
                  recursive_find(task_spec.spec.start)
  
              for t in task_spec.outputs:
                  recursive_find(t)
  
          recursive_find(self.start)
  
          return lanes
docs: Returns a set of the distinct lane names used in the process (including
          called activities)