digraph petrinet {
    PROGRAM_END [shape="circle" xlabel="PROGRAM_END" label=""];
    PROGRAM_PANIC [shape="circle" xlabel="PROGRAM_PANIC" label=""];
    PROGRAM_START [shape="circle" xlabel="PROGRAM_START" label="•"];
    main_BB1 [shape="circle" xlabel="main_BB1" label=""];
    call_0_RETURN [shape="box" xlabel="" label="call_0_RETURN"];
    main_RETURN [shape="box" xlabel="" label="main_RETURN"];
    PROGRAM_START -> call_0_RETURN;
    main_BB1 -> main_RETURN;
    call_0_RETURN -> main_BB1;
    main_RETURN -> PROGRAM_END;
}