Here is my JavaScript code:

```
function Show(output, startX, startY){
    var c = document.getElementById("myCanvas");
    var context = c.getContext("2d");
        context.arc(startX, startY, 3, 0, Math.PI*2, true);
        context.fill();
        context.arc(startX + 50, startY, 3, 0, Math.PI*2, true);
        context.stroke();
}
Show(outputcpu, 50, 50);
Show(outputio, 70, 50);

```

I have expect some thing like: `o-o o-o`.

But not sure why I get: `o-o-o-o`.

How to remove the center stroke? (I want to remove the second line o-o\**-*\*o-o)