Graphviz and Finite Automata diagrams - II

another example with source code. But the state q3 is placed in the top side of the generated graph, which I don't like. It is not possible to place a arrow for the start circle without having the source->target syntax, so I did some workaround, by changing the color of the point to white and make it invisible, and it works!!

source code:
digraph finite_state_machine {
    rankdir=LR;
    ranksep=0.5;
     
    node [shape = point, color=white, fontcolor=white]; start;
    node [shape = doublecircle, color=black, fontcolor=black]; q3;
    node [shape = circle]; q1;
    start -> q1;
    q1 -> q2 [ label = "a" ];
    q2 -> q1 [ label = "a" ];
    q2 -> q2 [ label = "b" ];
 
    q3 -> q2 [ label = "a" ];
    q3 -> q1 [ label = "b" ];
    q1 -> q3 [ label = "b" ];
    
}