digraph {
    a [label=12, entity_id=12, entity_class="truck"];
    b [label=7, entity_id=7,entity_class="bike"];
    c [label=3, entity_id=3, entity_class="car"];
    a -> b[label="solid edge"];                     
    a -> b [label="dashed edge", style=dashed]; 
    a -> c [label="dashed edge", style=dashed]; 
    a -> c [label="dotted edge", style=dotted];      
}