Add

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    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 20 20"
>
    <linearGradient
        id="a"
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        x2="17.319"
        y1="19.532"
        y2="1.949"
        gradientUnits="userSpaceOnUse"
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        <stop offset="0" stop-color="#fff33b" />
        <stop offset=".04" stop-color="#fee72e" />
        <stop offset=".117" stop-color="#fed51b" />
        <stop offset=".196" stop-color="#fdca10" />
        <stop offset=".281" stop-color="#fdc70c" />
        <stop offset=".669" stop-color="#f3903f" />
        <stop offset=".888" stop-color="#ed683c" />
        <stop offset="1" stop-color="#e93e3a" />
    </linearGradient>
    <g fill="url(#a)">
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</svg>