Error 404

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 64 64"
>
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        id="a"
        x1="-2.673"
        x2="58.452"
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        y2="64.432"
        gradientUnits="userSpaceOnUse"
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        <stop offset="0" stop-color="#66bb6a" />
        <stop offset="1" stop-color="#2d98d4" />
    </linearGradient>
    <linearGradient
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        x1="-2.752"
        x2="58.373"
        y1="3.386"
        y2="64.511"
        href="#a"
    />
    <linearGradient
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        x1="15.968"
        x2="77.093"
        y1="-15.334"
        y2="45.791"
        href="#a"
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