code: def nice_true_ces(tc):
      
      cause_list = []
      next_list = []
      cause = '<--'
      effect = '-->'
      for event in tc:
          if event.direction == Direction.CAUSE:
              cause_list.append(["{0:.4f}".format(round(event.alpha, 4)),
                                 event.mechanism, cause, event.purview])
          elif event.direction == Direction.EFFECT:
              next_list.append(["{0:.4f}".format(round(event.alpha, 4)),
                                event.mechanism, effect, event.purview])
          else:
              validate.direction(event.direction)
  
      true_list = [(cause_list[event], next_list[event])
                   for event in range(len(cause_list))]
      return true_list
docs: Format a true |CauseEffectStructure|.