*/
  public static <K, V> ImmutableSortedMap<K, V> copyOf(
      Iterable<? extends Entry<? extends K, ? extends V>> entries,
      Comparator<? super K> comparator) {
    return fromEntries(checkNotNull(comparator), false, entries);
  }

  /**
   * Returns an immutable map containing the same entries as the provided sorted map, with the same
   * ordering.
   *

  /**
   * Ensures the truth of an expression involving one or more parameters to the calling method.
   *
   * @param expression a boolean expression
   * @throws IllegalArgumentException if {@code expression} is false
   */
  public static void checkArgument(boolean expression) {
    if (!expression) {
      throw new IllegalArgumentException();
    }
  }

  /**

      @Override
      public void remove() {
        checkConcurrentModification();
        checkRemove(canRemove);
        elements.remove(--index);
        expectedModCount = ++modCount;
        canRemove = false;
      }

      void checkConcurrentModification() {
        if (expectedModCount != modCount) {
          throw new ConcurrentModificationException();
        }
      }
    }
  }

    try {
      generateCancellationCauses =
          Boolean.parseBoolean(
              System.getProperty("guava.concurrent.generate_cancellation_cause", "false"));
    } catch (SecurityException e) {
      generateCancellationCauses = false;
    }
    GENERATE_CANCELLATION_CAUSES = generateCancellationCauses;
  }

  /**

    assertThat(map.tailMap("three", false).entrySet()).contains(mapEntry("two", 3));
    assertNull(map.tailMap("three", true).lowerEntry("three"));
    assertThat(map.headMap("two", false).values()).containsExactly(3, 5).inOrder();
    assertThat(map.headMap("two", false).descendingMap().values()).containsExactly(5, 3).inOrder();

    assertThat(map.tailMap("three", false).entrySet()).contains(mapEntry("two", 3));
    assertNull(map.tailMap("three", true).lowerEntry("three"));
    assertThat(map.headMap("two", false).values()).containsExactly(3, 5).inOrder();
    assertThat(map.headMap("two", false).descendingMap().values()).containsExactly(5, 3).inOrder();

   */
  public static <K, V> ImmutableSortedMap<K, V> copyOf(
      Iterable<? extends Entry<? extends K, ? extends V>> entries,
      Comparator<? super K> comparator) {
    return fromEntries(checkNotNull(comparator), false, entries);
  }

  /**
   * Returns an immutable map containing the same entries as the provided sorted map, with the same
   * ordering.
   *

        return Synchronized.navigableSet(delegate().headSet(toElement, inclusive), mutex);
      }
    }

    @Override
    public SortedSet<E> headSet(E toElement) {
      return headSet(toElement, false);
    }

    @Override
    @CheckForNull
    public E higher(E e) {
      synchronized (mutex) {
        return delegate().higher(e);
      }
    }

    @Override

              }
              return false;
            }

            if (map.valueEquivalence().equivalent(oldValue, entryValue)) {
              ++modCount;
              setValue(e, newValue);
              return true;
            } else {
              // Mimic
              // "if (map.containsKey(key) && map.get(key).equals(oldValue))..."
              return false;
            }
          }

      if (!(object instanceof List)) {
        return false;
      }
      List<?> list = (List<?>) object;
      if (list.size() != axes.size()) {
        return false;
      }
      int i = 0;
      for (Object o : list) {
        if (!axes.get(i).contains(o)) {
          return false;
        }
        i++;
      }
      return true;
    }