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<clipPath id="clip" clipPathUnits="userSpaceOnUse"> | |
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<rect x="0.25" y="0.25" width="0.5" height="0.5" fill="white" clip-path="url(#clip)"/> | |
</mask> | |
<rect x="0" y="0" height="200" width="200" fill="green" mask="url(#mask)"/> | |
</svg> |