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<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
width="400" height="400">
<filter id="filter" filterUnits="objectBoundingBox" x="-10%" y="-10%" width="120%" height="120%">
<!-- First, swap the red and green channels (turn the red rectangle into green) -->
<feColorMatrix type="matrix"
values="0 1 0 0 0
1 0 0 0 0
0 0 1 0 0
0 0 0 1 0"/>
<!-- Second, no-op blur because stdDeviation is negative-->
<feGaussianBlur stdDeviation="-1 -1"/>
</filter>
<g filter="url(#filter)">
<rect x="100" y="100" width="50" height="50" fill="red"/>
<rect x="200" y="100" width="50" height="50" fill="red"/>
</g>
</svg>
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