text: import abc
  
  
  class AttackPointOptimizer:
      """
      Abstract attack-point optimizer.
  
      Attack-point optimizers may alter the number, order, and individual
      durations of leaves in a logical tie, but may not alter the overall
      duration of that logical tie.
  
      They effectively "clean up" notation, post-quantization.
      """
  
      ### CLASS VARIABLES ###
  
      __slots__ = ()
  
      ### SPECIAL METHODS ###
  
      @abc.abstractmethod
      def __call__(self, argument):
          r"""Calls attack-point optimizer."""
          raise NotImplementedError
  