Pixel grid patterns

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      <path fill="currentColor" d="M-20-20h40v40h-40zm0 100h40v40h-40zM80-20h40v40H80zm0 100h40v40H80zM25 25h10v10H25zm20 20h10v10H45zm20 20h10v10H65zm0-40h10v10H65zM25 65h10v10H25z"/>
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