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<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewbox="0 0 1800 1000" width="1800px" height="1000px">
<polygon fill="black" points="100,100 100,800 1700,800 1700,100 1500,100 1500,600 300,600 300,100" />
</svg>