digraph block {
    N0[label="entry"];
    N1[label="exit"];
    N2[label="expr 3i"];
    N3[label="expr 33i"];
    N4[label="expr 3i + 33i"];
    N5[label="stmt 3i + 33i;"];
    N6[label="block { 3i + 33i; }"];
    N0 -> N2;
    N2 -> N3;
    N3 -> N4;
    N4 -> N5;
    N5 -> N6;
    N6 -> N1;
}