/**
 * A navigable set which forwards all its method calls to another navigable set. Subclasses should
 * override one or more methods to modify the behavior of the backing set as desired per the <a
 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingNavigableSet} forward <i>indiscriminately</i>

 * which will still appear when iterating over the table's contents in a foreach loop or a call to a
 * null-hostile method like {@link ImmutableTable#copyOf}. For alternatives, please see <a
 * href="https://github.com/google/guava/wiki/NewCollectionTypesExplained#table">the wiki</a>.
 *
 * <p>The allowed row and column keys must be supplied when the table is created. The table always

 * treat primitive {@code long} values as unsigned, using the methods from {@link UnsignedLongs}.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/PrimitivesExplained#unsigned-support">unsigned
 * primitive utilities</a>.
 *
 * @author Louis Wasserman
 * @author Colin Evans
 * @since 11.0
 */
@GwtCompatible

 * SortedMap}, {@link BiMap}, etc.). Also see this class's counterparts {@link Lists}, {@link Sets}
 * and {@link Queues}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/CollectionUtilitiesExplained#maps">{@code Maps}</a>.
 *
 * @author Kevin Bourrillion
 * @author Mike Bostock
 * @author Isaac Shum
 * @author Louis Wasserman
 * @since 2.0

    return subtype;
  }

  /**
   * Returns true if this type is a supertype of the given {@code type}. "Supertype" is defined
   * according to <a
   * href="https://docs.oracle.com/javase/specs/jls/se25/html/jls-4.html#jls-4.5.1">the rules for
   * type arguments</a> introduced with Java generics.
   *
   * @since 19.0
   */

      if (!Files.isDirectory(parent)) {
        throw new IOException("Unable to create parent directories of " + path);
      }
    }
  }

  /**
   * Returns the <a href="http://en.wikipedia.org/wiki/Filename_extension">file extension</a> for
   * the file at the given path, or the empty string if the file has no extension. The result does
   * not include the '{@code .}'.
   *

   * #elapsed(TimeUnit)}, this method does not lose any precision due to rounding.
   *
   * <p><b>Warning:</b> do not call this method from Android code unless you are on Android API
   * level 26+ or you <a
   * href="https://developer.android.com/studio/write/java11-default-support-table">opt in to
   * library desugaring</a>.
   *
   * @since 33.4.0 (but since 22.0 in the JRE flavor)
   */

/**
 * A {@link Network} whose elements and structural relationships will never change. Instances of
 * this class may be obtained with {@link #copyOf(Network)}.
 *
 * <p>See the Guava User's Guide's <a
 * href="https://github.com/google/guava/wiki/GraphsExplained#immutable-implementations">discussion
 * of the {@code Immutable*} types</a> for more information on the properties and guarantees
 * provided by this class.
 *

 *
 * <p>For a {@link Set} whose contents are specified by a {@link Range}, see {@link ContiguousSet}.
 *
 * <p>See the Guava User Guide article on <a href=
 * "https://github.com/google/guava/wiki/NewCollectionTypesExplained#rangeset">RangeSets</a>.
 *
 * @author Kevin Bourrillion
 * @author Louis Wasserman
 * @since 14.0
 */

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