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<svg height="192" width="192" xmlns="http://www.w3.org/2000/svg">
<!-- gradients -->
<linearGradient id="foregroundColour" x1="0" x2="1" y1="0" y2="1">
<stop class="stop1" offset="0%" stop-color="#13e0c0" />
<stop class="stop2" offset="100%" stop-color="#92d875" />
</linearGradient>
<!-- clips -->
<clipPath id="semicircle-vertical-left">
<polygon points="0,0 96,0 96,192 0,192" />
</clipPath>
<clipPath id="semicircle-horizontal-low">
<polygon points="0,96 92,96 96,92 100,96 192,96 192,192 0,192" />
</clipPath>
<clipPath id="semicircle-vertical-right">
<polygon points="96,0 192,0 192,192 96,192" />
</clipPath>
<clipPath id="semicircle-horizontal-high">
<polygon points="0,0 192,0 192,96 0,96" />
</clipPath>
<!-- masks -->
<mask id="background">
<rect fill="#FFF" height="768" width="768" />
<!-- the middle "window" -->
<circle cx="96" cy="96" fill="#000" r="72" />
<!-- vertical spiral arm border -->
<circle clip-path="url(#semicircle-vertical-left)" cx="96" cy="138" fill="none" r="42" stroke="#FFF" stroke-width="24" />
<circle clip-path="url(#semicircle-vertical-right)" cx="96" cy="54" fill="none" r="42" stroke="#FFF" stroke-width="24" />
<!-- horizontal spiral arm border -->
<circle clip-path="url(#semicircle-horizontal-high)" cx="54" cy="96" fill="none" r="42" stroke="#FFF" stroke-width="24" />
<circle clip-path="url(#semicircle-horizontal-low)" cx="138" cy="96" fill="none" r="42" stroke="#FFF" stroke-width="24" />
</mask>
<mask id="foreground">
<!-- outer ring -->
<circle cx="96" cy="96" fill="none" r="84" stroke="#FFF" stroke-width="8" />
<!-- vertical spiral arm border -->
<circle clip-path="url(#semicircle-vertical-left)" cx="96" cy="138" fill="none" r="42" stroke="#000" stroke-width="16" />
<circle clip-path="url(#semicircle-vertical-right)" cx="96" cy="54" fill="none" r="42" stroke="#000" stroke-width="16" />
<!-- vertical spiral arm -->
<circle clip-path="url(#semicircle-vertical-left)" cx="96" cy="138" fill="none" r="42" stroke="#FFF" stroke-width="8" />
<circle clip-path="url(#semicircle-vertical-right)" cx="96" cy="54" fill="none" r="42" stroke="#FFF" stroke-width="8" />
<!-- horizontal spiral arm border -->
<circle clip-path="url(#semicircle-horizontal-high)" cx="54" cy="96" fill="none" r="42" stroke="#000" stroke-width="16" />
<circle clip-path="url(#semicircle-horizontal-low)" cx="138" cy="96" fill="none" r="42" stroke="#000" stroke-width="16" />
<!-- horizontal spiral arm border -->
<circle clip-path="url(#semicircle-horizontal-high)" cx="54" cy="96" fill="none" r="42" stroke="#FFF" stroke-width="8" />
<circle clip-path="url(#semicircle-horizontal-low)" cx="138" cy="96" fill="none" r="42" stroke="#FFF" stroke-width="8" />
</mask>
<!-- fills -->
<rect fill="#FAFAFA" height="192" width="192" x="0" y="0" />
<rect fill="#222222" height="192" mask="url(#background)" width="192" x="0" y="0" />
<rect fill="url(#foregroundColour)" height="192" mask="url(#foreground)" width="192" x="0" y="0" />
</svg>
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