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<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg width="20cm" height="15cm" viewBox="0 0 800 600"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink/"
baseProfile="tiny" version="1.2">
<title>Spheres</title>
<desc>Semi-transparent bubbles on a colored background.</desc>
<defs>
<!-- Create radial gradients for each bubble. -->
<radialGradient id="blueBubble" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" stop-opacity="1" />
<stop offset="25%" stop-color="#cdcdff" stop-opacity=".65" />
<stop offset="100%" stop-color="#cdaacd" stop-opacity=".75" />
</radialGradient>
<radialGradient id="redBubble" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" stop-opacity="1" />
<stop offset="25%" stop-color="#ffcdcd" stop-opacity=".65" />
<stop offset="100%" stop-color="#bbbb99" stop-opacity=".75" />
</radialGradient>
<radialGradient id="greenBubble" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" stop-opacity="1" />
<stop offset="25%" stop-color="#cdffcd" stop-opacity=".65" />
<stop offset="100%" stop-color="#99aaaa" stop-opacity=".75" />
</radialGradient>
<radialGradient id="yellowBubble" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" stop-opacity="1" />
<stop offset="25%" stop-color="#ffffcd" stop-opacity=".65" />
<stop offset="100%" stop-color="#bbbbaa" stop-opacity=".75" />
</radialGradient>
<radialGradient id="background" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="400" fx="250" fy="250">
<stop offset="0%" stop-color="#ffffee" />
<stop offset="100%" stop-color="#ccccaa" />
</radialGradient>
<linearGradient id="surface" gradientUnits="userSpaceOnUse"
x1="-100" y1="200" x2="400" y2="200">
<stop offset="0%" stop-color="#ffffcc" />
<stop offset="100%" stop-color="#bbbb88" />
</linearGradient>
<!-- Create radial gradients for each circle to make them look like
spheres. -->
<radialGradient id="blueSphere" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" />
<stop offset="75%" stop-color="blue" />
<stop offset="100%" stop-color="#222244" />
</radialGradient>
<radialGradient id="redSphere" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" />
<stop offset="75%" stop-color="red" />
<stop offset="100%" stop-color="#442222" />
</radialGradient>
<radialGradient id="greenSphere" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" />
<stop offset="75%" stop-color="green" />
<stop offset="100%" stop-color="#113311" />
</radialGradient>
<radialGradient id="yellowSphere" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="-50">
<stop offset="0%" stop-color="white" />
<stop offset="75%" stop-color="yellow" />
<stop offset="100%" stop-color="#444422" />
</radialGradient>
<radialGradient id="shadowGrad" gradientUnits="userSpaceOnUse"
cx="0" cy="0" r="100" fx="-50" fy="50">
<stop offset="0%" stop-color="black" stop-opacity="1.0" />
<stop offset="100%" stop-color="white" stop-opacity="0.0" />
</radialGradient>
<!-- Define a shadow for each sphere. -->
<circle id="shadow" fill="url(#shadowGrad)" cx="0" cy="0" r="100" />
<g id="bubble">
<circle cx="0" cy="0" r="100" />
</g>
</defs>
<g>
<rect fill="url(#background)" x="0" y="0" width="800" height="600" />
</g>
<g transform="translate(200,700)">
<use xlink:href="#bubble" fill="url(#blueBubble)" />
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="1s" dur="10s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(315,700)">
<g transform="scale(0.5,0.5)">
<use xlink:href="#bubble" fill="url(#redBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="3s" dur="7s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(80,700)">
<g transform="scale(0.65,0.65)">
<use xlink:href="#bubble" fill="url(#greenBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="5s" dur="9s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(255,700)">
<g transform="scale(0.3,0.3)">
<use xlink:href="#bubble" fill="url(#yellowBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="2s" dur="6s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(565,700)">
<g transform="scale(0.4,0.4)">
<use xlink:href="#bubble" fill="url(#blueBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="4s" dur="8s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(715,700)">
<g transform="scale(0.6,0.6)">
<use xlink:href="#bubble" fill="url(#redBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="1s" dur="4s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(645,700)">
<g transform="scale(0.375,0.375)">
<use xlink:href="#bubble" fill="url(#greenBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="0s" dur="11s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(555,700)">
<g transform="scale(0.9,0.9)">
<use xlink:href="#bubble" fill="url(#yellowBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="3s" dur="7.5s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(360,700)">
<g transform="scale(0.5,0.5)">
<use xlink:href="#bubble" fill="url(#blueBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="3s" dur="6s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(215,700)">
<g transform="scale(0.45,0.45)">
<use xlink:href="#bubble" fill="url(#redBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="5.5s" dur="7s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(420,700)">
<g transform="scale(0.75,0.75)">
<use xlink:href="#bubble" fill="url(#greenBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="1s" dur="9s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(815,700)">
<g transform="scale(0.6,0.6)">
<use xlink:href="#bubble" fill="url(#yellowBubble)" />
</g>
<animateTransform attributeName="transform" type="translate"
values="0,0; 0,-800" begin="2s" dur="9.5s" fill="freeze" repeatCount="indefinite" />
</g>
<g transform="translate(225,375)" >
<g transform="scale(1.0,0.5)" >
<path d="M 0 0 L 350 0 L 450 450 L -100 450 z"
fill="url(#surface)" stroke="none" />
</g>
</g>
<g transform="translate(200,0)" >
<g transform="translate(200,375)">
<use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
<circle fill="url(#blueSphere)" cx="0" cy="0" r="100" />
</g>
<g transform="translate(315,440)">
<g transform="scale(0.5,0.5)">
<use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
<circle fill="url(#redSphere)" cx="0" cy="0" r="100" />
</g>
</g>
<g transform="translate(80,475)">
<g transform="scale(0.65,0.65)">
<use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
<circle fill="url(#greenSphere)" cx="0" cy="0" r="100" />
</g>
</g>
<g transform="translate(255,525)">
<g transform="scale(0.3,0.3)">
<use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
<circle fill="url(#yellowSphere)" cx="0" cy="0" r="100" />
</g>
</g>
</g>
</svg>
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