Duration initial = MonotonicClock.elapsed();
        Thread.sleep(50); // Longer delay for more reliable measurement
        Duration later = MonotonicClock.elapsed();

        assertTrue(later.compareTo(initial) > 0, "Elapsed time should increase");
        assertTrue(
                later.minus(initial).toMillis() >= 45,
                "Elapsed time difference should be at least 45ms (accounting for some timing variance)");

   */
  @CanIgnoreReturnValue
  @Override
  public boolean put(@ParametricNullness K key, @ParametricNullness V value) {
    return super.put(key, value);
  }

  /**
   * Compares the specified object to this multimap for equality.
   *
   * <p>Two {@code SetMultimap} instances are equal if, for each key, they contain the same values.
   * Equality does not depend on the ordering of keys or values.

   */
  @CanIgnoreReturnValue
  @Override
  public boolean put(@ParametricNullness K key, @ParametricNullness V value) {
    return super.put(key, value);
  }

  /**
   * Compares the specified object to this multimap for equality.
   *
   * <p>Two {@code SetMultimap} instances are equal if, for each key, they contain the same values.
   * Equality does not depend on the ordering of keys or values.

     *   <li>Ensures no null repository entries exist in the list</li>
     * </ul>
     *
     * <p>Duplicate detection is based on the {@code RemoteRepository#equals(Object)}
     * method, which typically compares repository IDs and URLs.
     *
     * @param repositories the list of repositories to validate, may be {@code null}
     * @return the same list if validation passes, or {@code null} if input was {@code null}

    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t09-b</artifactId>
      <version>1.0</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>t10-b</artifactId>
      <version>1.0</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  </repositories>
  <dependencies>
    <dependency>
      <groupId>maven-test</groupId>
      <artifactId>maven-test-b</artifactId>
      <version>1.0</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

        return groupByMajor.get(major).stream().filter(v -> v.getMinor() == minor).max(Version::compareTo).orElse(null);
    }

    private Version getLatestVersionByKey(Map<Integer, List<Version>> groupByMajor, int key) {
        return groupByMajor.getOrDefault(key, emptyList())
            .stream()
            .max(Version::compareTo)
            .orElseThrow(() -> new IllegalStateException("Unexpected number of versions in collection"));

  /**
   * Returns an unmodifiable map describing keys that appear in both maps, but with different
   * values.
   */
  Map<K, ValueDifference<V>> entriesDiffering();

  /**
   * Compares the specified object with this instance for equality. Returns {@code true} if the
   * given object is also a {@code MapDifference} and the values returned by the {@link

    }

    @Override
    public boolean equals(@Nullable Object o) {
      return (o instanceof Foo) && ((Foo) o).value.equals(value);
    }

    @Override
    public int compareTo(Foo other) {
      return value.compareTo(other.value);
    }
  }