Icon of Expand Alt 2

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<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M3 21L21 3M3 21H7.5M3 21L3 16.5M21 3H16.5M21 3V7.5" stroke="#000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
</svg>