digraph G {
    58 -> 57;
    57 -> 61;
    61 -> 1;
    1 -> 4;
    4 -> 7;
    7 -> 10;
    10 -> 12;
    12 -> 14;
    14 -> 17;
    17 -> 20;
    20 -> 34;
    34 -> 22 [label="T"];
    34 -> 32 [label="F"];
    22 -> 25;
    25 -> 28;
    28 -> 30;
    30 -> 37;
    37 -> 40;
    40 -> 43;
    43 -> 55;
    55 -> 45 [label="T"];
    55 -> 2 [label="F"];
    45 -> 48;
    2 -> 60;
    48 -> 51;
    51 -> 53;
    53 -> 37;
    60 -> 59;
    32 -> 37;
    61 -> 60;

    58 [label="58: None"];
    57 [label="57: 3"];
    61 [label="61: CALL f(3)", shape=box, style=filled, color=orange];
    1 [label="1: START f(x)", shape=box, style=filled, color=green];
    4 [label="4: 2"];
    7 [label="7: x"];
    10 [label="10: (2*x)"];
    12 [label="12: x=(2*x)"];
    14 [label="14: x"];
    17 [label="17: 0"];
    20 [label="20: (x>0)"];
    34 [label="34: <>", shape=diamond];
    22 [label="22: x"];
    32 [label="32: x"];
    25 [label="25: 1"];
    28 [label="28: (x-1)"];
    30 [label="30: x=(x-1)"];
    37 [label="37: x"];
    40 [label="40: 0"];
    43 [label="43: (x>0)"];
    55 [label="55: <>", shape=diamond];
    45 [label="45: x"];
    60 [label="60: RET f(3)", shape=box, style=filled, color=orange];
    59 [label="59: None"];
    48 [label="48: 1"];
    51 [label="51: (x-1)"];
    53 [label="53: x=(x-1)"];
    2 [label="2: END f(x)", shape=box, style=filled, color=green];
}