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xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
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<rect x="200" y="0" fill="none" width="200" height="200" transform="translate(-200,0)" id="crect" />
<clipPath id="clip"><use xlink:href="#crect" /></clipPath>
<rect fill="green" stroke="none" x="0" y="0" width="400" height="200" clip-path="url(#clip)" />
</svg>