code: def filter_pipeline(effects, filters):
      
      for filter_fn in filters:
          filtered_effects = filter_fn(effects)
          if len(effects) == 1:
              return effects
          elif len(filtered_effects) > 1:
              effects = filtered_effects
      return effects
docs: Apply each filter to the effect list sequentially. If any filter
      returns zero values then ignore it. As soon as only one effect is left,
      return it.
  
      Parameters
      ----------
      effects : list of MutationEffect subclass instances
  
      filters : list of functions
          Each function takes a list of effects and returns a list of effects
  
      Returns list of effects