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<canvas id=dest height="768" width="1024"></canvas>
<script>
var c=document.getElementById("dest");
var ctx=c.getContext("2d");
ctx.setTransform(1,0,0,1,0,0);
ctx.transform(1,0,0,1,512,384);
ctx.globalAlpha=0.5;
ctx.beginPath();
ctx.moveTo(0,324);
ctx.lineTo(239.66624210637872,84.6706564587356);
ctx.lineTo(78.17543855489896,-213.5804865149861);
ctx.lineTo(-136.36617853185373,-262.93052317185794);
ctx.lineTo(-195.91764235680165,51.60583806061618);
ctx.lineTo(0,324);
ctx.closePath();
ctx.fillStyle="rgba(0,0,0,0)";
ctx.fill();
ctx.lineWidth=40;
ctx.lineCap="butt";
ctx.lineJoin="miter";
ctx.miterLimit="10";
ctx.strokeStyle="#555555";
ctx.stroke();
</script>