roke="#000000" stroke-width="2" d="M459.25,-71.88C523.25,-71.88 539.25,-70.88 603.25,-70.88"/>
<path fill="none" stroke="#000000" stroke-width="2" d="M459.25,-73.87C523.38,-73.87 539.37,-72.87 603.25,-72.87"/>
</g>
<!-- W1&#45;&#45;X1 -->
<g id="edge6" class="edge">
<title>W1:e&#45;&#45;X1:w</title>
<path fill="none" stroke="#000000" stroke-width="2" d="M459.25,-44.88C523.38,-44.88 539.37,-45.88 603.25,-45.88"/>
<path fill="none" stroke="#000000" stroke-width="2" d="M459.25,-46.88C523.25,-46.88 539.25,-47.8