digraph finite_state_machine {

    	fontname="Helvetica,Arial,sans-serif"

    	node [fontname="Helvetica,Arial,sans-serif"]

    	edge [fontname="Helvetica,Arial,sans-serif"]

    	rankdir=LR;

    	node [shape = circle];

    
 3 -> 0 [label = "1"];
 2 -> 0 [label = "1"];
 1 -> 0 [label = "1"];
}