*     FIRST_LETTER_MULTIMAP.putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a'));
   *     FIRST_LETTER_MULTIMAP.putAll('a', Arrays.asList('p', 'p', 'l', 'e'));
   *     FIRST_LETTER_MULTIMAP.putAll('c', Arrays.asList('a', 'r', 'r', 'o', 't'));
   *     FIRST_LETTER_MULTIMAP.putAll('a', Arrays.asList('s', 'p', 'a', 'r', 'a', 'g', 'u', 's'));
   *     FIRST_LETTER_MULTIMAP.putAll('c', Arrays.asList('h', 'e', 'r', 'r', 'y'));
   * }

      }
    }

    @Override
    public boolean putAll(@ParametricNullness K key, Iterable<? extends V> values) {
      synchronized (mutex) {
        return delegate().putAll(key, values);
      }
    }

    @Override
    public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
      synchronized (mutex) {
        return delegate().putAll(multimap);
      }
    }

    @Override

      }
    }

    @Override
    public boolean putAll(@ParametricNullness K key, Iterable<? extends V> values) {
      synchronized (mutex) {
        return delegate().putAll(key, values);
      }
    }

    @Override
    public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
      synchronized (mutex) {
        return delegate().putAll(multimap);
      }
    }

    @Override

        .that(bucketsOf(map1))
        .isEqualTo(initialBuckets);

    /*
     * Something slightly different happens when the entries are added all at
     * once; make sure that passes too.
     */
    map2.putAll(map1);
    assertWithMessage("table size after adding %s elements", size)
        .that(bucketsOf(map1))
        .isEqualTo(initialBuckets);

        .that(bucketsOf(map1))
        .isEqualTo(initialBuckets);

    /*
     * Something slightly different happens when the entries are added all at
     * once; make sure that passes too.
     */
    map2.putAll(map1);
    assertWithMessage("table size after adding %s elements", size)
        .that(bucketsOf(map1))
        .isEqualTo(initialBuckets);

     *
     * @throws NullPointerException if any key or value in {@code map} is null
     */
    @CanIgnoreReturnValue
    @Override
    public Builder<K, V> putAll(Map<? extends K, ? extends V> map) {
      super.putAll(map);
      return this;
    }

    /**
     * Adds all the given entries to the built map. Duplicate keys, according to the comparator

            Properties profileProps = new Properties();
            for (Profile profile : activeExternalProfiles) {
                profileProps.putAll(profile.getProperties());
            }
            profileProps.putAll(profileActivationContext.getUserProperties());
            profileActivationContext.setUserProperties(profileProps);
        }

        problems.setRootModel(inputModel);

        Properties userSpecifiedProperties =
                commandLine.getOptionProperties(String.valueOf(CLIManager.SET_USER_PROPERTY));
        userProperties.putAll(userSpecifiedProperties);

        // ----------------------------------------------------------------------
        // Load config files
        // ----------------------------------------------------------------------

     *
     * @param convertUrlMap the map of regex patterns to replacement strings
     */
    public void setConvertUrlMap(final Map<String, String> convertUrlMap) {
        this.convertUrlMap.putAll(convertUrlMap);
    }

    /**
     * Adds a URL conversion rule.
     *
     * @param regex the regular expression pattern to match
     * @param replacement the replacement string
     */

                        .collect(HashMap<String, List<String>>::new, (m, d) -> m.put(d.getFirst(), Arrays.asList(d.getSecond().split(","))),
                                HashMap::putAll));
            }
            propMap.put(DEFAULT_LABEL_VALUES, map);
        }
        return map.entrySet().stream().flatMap(e -> {
            final String key = e.getKey();