code: def batch_remove(self,
                       removals: Iterable[Tuple[int, ops.Operation]]) -> None:
          
          copy = self.copy()
          for i, op in removals:
              if op not in copy._moments[i].operations:
                  raise ValueError(
                      "Can't remove {} @ {} because it doesn't exist.".format(
                          op, i))
              copy._moments[i] = ops.Moment(
                  old_op
                  for old_op in copy._moments[i].operations
                  if op != old_op)
          self._device.validate_circuit(copy)
          self._moments = copy._moments
docs: Removes several operations from a circuit.
  
          Args:
              removals: A sequence of (moment_index, operation) tuples indicating
                  operations to delete from the moments that are present. All
                  listed operations must actually be present or the edit will
                  fail (without making any changes to the circuit).
  
          ValueError:
              One of the operations to delete wasn't present to start with.
  
          IndexError:
              Deleted from a moment that doesn't exist.