)
    time.sleep(sleep_time)

    # Get PR
    logging.debug(f"Processing PR: #{number}")
    pr = repo.get_pull(number)
    label_strs = {label.name for label in pr.get_labels()}
    langs = []
    for label in label_strs:
        if label.startswith("lang-") and not label == lang_all_label:
            langs.append(label[5:])
    logging.info(f"PR #{pr.number} has labels: {label_strs}")

        final List<Vertex> children = new ArrayList<>();
        final List<Vertex> parents = new ArrayList<>();

        Vertex(String label) {
            this.label = label;
        }

        String getLabel() {
            return label;
        }

        List<Vertex> getChildren() {
            return children;
        }

        List<Vertex> getParents() {
            return parents;
        }