data.add(new String[] {k, line.trim()});
            } else {
                k = line;
            }
        }
        Collections.shuffle(data);

        Graph g = new Graph();
        data.parallelStream().forEach(s -> {
            try {
                g.addEdge(s[0], s[1]);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        });
    }