code: private void parseLikelySubtags(JsonObject root) {
      JsonObject node = resolve(root, "supplemental", "likelySubtags");
      for (Map.Entry<String, JsonElement> entry : node.entrySet()) {
        likelySubtags.put(entry.getKey(), entry.getValue().getAsString());
      }
    }
docs: Parse likely subtags tree.