List<T> newList = new ArrayList<>(scenario.strictlyOrderedList);
        Collections.reverse(newList);
        return new Scenario<T>(scenario.ordering.reverse(), newList, scenario.emptyArray);
      }
    },
    NULLS_FIRST {
      @Override
      <T extends @Nullable Object> Scenario<?> mutate(Scenario<T> scenario) {
        List<T> newList = Lists.newArrayList((T) null);

        List<T> newList = new ArrayList<>(scenario.strictlyOrderedList);
        Collections.reverse(newList);
        return new Scenario<T>(scenario.ordering.reverse(), newList, scenario.emptyArray);
      }
    },
    NULLS_FIRST {
      @Override
      <T extends @Nullable Object> Scenario<?> mutate(Scenario<T> scenario) {
        List<T> newList = Lists.newArrayList((T) null);

                        mapping.setElevateWordId(elevateWordId);
                        mapping.setLabelTypeId(id);
                        newList.add(mapping);
                    }
                }
                list.removeAll(matchedList);
                elevateWordToLabelBhv.batchInsert(newList, op -> {
                    op.setRefreshPolicy(Constants.TRUE);
                });