Graph with ordered entries

    /*
    new Graph([
            A: [B: 5, H: 2],
            B: [A: 5, C: 7],
            C: [B: 7, D: 3, G: 4],
            D: [C: 20, E: 4],
            E: [F: 5],
            F: [G: 6],
            G: [C: 4],
            H: [G: 3]
    ])
     */

    /*
    private static final Graph<String> COMPLEX_GRAPH = new Graph<>(Map.of(
            "A", Map.of("B", 5, "H", 2),
            "B", Map.of("A", 5, "C", 7),
            "C", Map.of("B", 7, "D", 3, "G", 4),
            "D", Map.of("C", 20, "E", 4),
            "E", Map.of("F", 5),
            "F", Map.of("G", 6),
            "G", Map.of("C", 4),
            "H", Map.of("G", 3)
    ));
     */

    private static final Graph<String> COMPLEX_GRAPH;

    static {
        var fromA = new LinkedHashMap<String, Number>();
        fromA.put("B", 5);
        fromA.put("H", 2);
        var fromB = new LinkedHashMap<String, Number>();
        fromB.put("A", 5);
        fromB.put("C", 7);
        var fromC = new LinkedHashMap<String, Number>();
        fromC.put("B", 7);
        fromC.put("D", 3);
        fromC.put("G", 4);
        var fromD = new LinkedHashMap<String, Number>();
        fromD.put("C", 20);
        fromD.put("E", 4);
        var fromE = new LinkedHashMap<String, Number>();
        fromE.put("F", 5);
        var fromF = new LinkedHashMap<String, Number>();
        fromF.put("G", 6);
        var fromG = new LinkedHashMap<String, Number>();
        fromG.put("C", 4);
        var fromH = new LinkedHashMap<String, Number>();
        fromH.put("G", 3);

        var nodes = new LinkedHashMap<String, Map<String, Number>>();
        nodes.put("A", fromA);
        nodes.put("B", fromB);
        nodes.put("C", fromC);
        nodes.put("D", fromD);
        nodes.put("E", fromE);
        nodes.put("F", fromF);
        nodes.put("G", fromG);
        nodes.put("H", fromH);

        COMPLEX_GRAPH = new Graph<>(nodes);
    }