Getting GraphViz to eliminate duplicate edges [duplicate]

Question

I have the following .dot language file for GraphViz:

digraph {
    graph [ dpi = 300 ];
    Hello -> World
    Hello -> World
    Hello -> World
}

Which renders as:

But I don;t want the duplicate links i.e. I want it to render as:

Yes, I could add logic to the program that produces the dot file, but if there is a GraphVix parameter to do this it’d be very useful.

Thanks.

Edit: Raising the dead here, but the question of which this is marked as a duplicate has multiple connections between 2 nodes but each with different labels, so not exactly the same, although the suggestion to use the ‘strict’ keyword does work.

Answer 1

‘strict’ was the answer :

strict digraph {
    graph [ dpi = 300 ];
    Hello -> World
    Hello -> World
    Hello -> World
}