R extends @Nullable Object, C extends @Nullable Object, V extends @Nullable Object>
    implements Table<R, C, V> {

  @Override
  public boolean containsRow(@Nullable Object rowKey) {
    return Maps.safeContainsKey(rowMap(), rowKey);
  }

  @Override
  public boolean containsColumn(@Nullable Object columnKey) {
    return Maps.safeContainsKey(columnMap(), columnKey);
  }

  @Override
  public Set<R> rowKeySet() {

    private ArtifactRepositoryPolicy snapshots;

    private ArtifactRepositoryPolicy releases;

    private boolean blacklisted;

    private Authentication authentication;

    private Proxy proxy;

    private List<ArtifactRepository> mirroredRepositories = Collections.emptyList();

    private boolean blocked;

    /**
     * Create a local repository or a test repository.
     *

        // Test each pattern and see what actually works
        for (String cron : potentiallyValidCrons) {
            boolean result = validator.isValid(cron, context);
            // Don't assert true/false here, just test that method doesn't throw
            assertNotNull(Boolean.valueOf(result), "Validation should return a boolean result for: " + cron);
        }
    }

    // Test edge cases to understand the validation behavior

          }
        }
      }
      return false;
    }
  }

  private boolean isExpired(Timestamped<V> stamped) {
    if ((expireAfterAccess == UNSET_INT) && (expireAfterWrite == UNSET_INT)) {
      return false;
    }

    boolean expireWrite = stamped.getWriteTimestamp() + expireAfterWrite <= currentTimeNanos();
    boolean expireAccess = stamped.getAccessTimestamp() + expireAfterAccess <= currentTimeNanos();

    public boolean removeAll(Collection<?> collection) {
      boolean changed = false;
      Iterator<E> itr = unfiltered.iterator();
      while (itr.hasNext()) {
        E e = itr.next();
        if (predicate.apply(e) && collection.contains(e)) {
          itr.remove();
          changed = true;
        }
      }
      return changed;
    }

    @Override
    public boolean retainAll(Collection<?> collection) {

    @Override
    public String toStringWithRelation() { // #pending
        return toString();
    }

    @Override
    public String buildDisplayString(String name, boolean column, boolean relation) { // #pending
        return toString();
    }

    // ===================================================================================

      return comparator;
    }
    return NATURAL_ORDER;
  }

  @Override
  public boolean containsKey(Object key) {
    try {
      return delegate.containsKey(checkValid(key));
    } catch (NullPointerException | ClassCastException e) {
      return false;
    }
  }

  @Override
  public boolean containsValue(Object value) {
    return delegate.containsValue(value);
  }

  @Override

      this.original = checkNotNull(original);
    }

    @Override
    public boolean matches(char c) {
      return !original.matches(c);
    }

    @Override
    public boolean matchesAllOf(CharSequence sequence) {
      return original.matchesNoneOf(sequence);
    }

    @Override
    public boolean matchesNoneOf(CharSequence sequence) {
      return original.matchesAllOf(sequence);
    }

    /** Total number of pages calculated from record count and page size. */
    private int allPageCount;

    /** Flag indicating whether a previous page exists. */
    private boolean existPrePage;

    /** Flag indicating whether a next page exists. */
    private boolean existNextPage;

    /** List of page numbers for pagination navigation. */
    private List<Integer> pageNumberList;

    /** Number of records to display per page. */

    .default(DEFAULT_TIMEOUT)

  val followRedirects: Boolean by option("-L", "--location").help("Follow redirects").flag()

  val allowInsecure: Boolean by option("-k", "--insecure").help("Allow connections to SSL sites without certs").flag()

  val showHeaders: Boolean by option("-i", "--include").help("Include protocol headers in the output").flag()

  val showHttp2Frames: Boolean by option("--frames").help("Log HTTP/2 frames to STDERR").flag()