221 lines
7.2 KiB
HTML
221 lines
7.2 KiB
HTML
<!--
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This work is licensed under CC BY-NC-ND 4.0
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Link to license: http://creativecommons.org/licenses/by-nc-nd/4.0/
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Attribute to Russell Georgi
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-->
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<html>
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<head>
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<title>
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Problem 5-15
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</title>
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<style>
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html, body {
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width: 100%;
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height: 100%;
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margin: 0px;
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border: 0;
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overflow: hidden;
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display: block;
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}
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canvas {
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position: absolute;
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}
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.dropbtn {
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background-color: #04AA6D;
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color: white;
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padding: 16px;
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font-size: 16px;
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border: none;
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}
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.dropbtnm {
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background-color: #04AA6D;
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color: white;
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padding: 16px;
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font-size: 16px;
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border: none;
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}
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.dropdown {
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position: absolute;
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display: inline-block;
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}
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.dropdown-content {
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display: none;
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position: relative;
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background-color: #f1f1f1;
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box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
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z-index: 1;
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}
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.dropdown-content button {
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color: black;
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padding: 12px 16px;
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width: 100px;
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text-decoration: none;
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display: block;
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}
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#m {
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left: 110px;
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}
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.dropdown-content a:hover {background-color: #ddd;}
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.dropdown:hover .dropdown-content {display: block;}
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.dropdown:hover .dropbtn {background-color: #3e8e41;}
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</style>
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</head>
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<body>
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<canvas id="myCanvas" width="1" height="1" style="border:1px solid #ffffff;">
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Your browser does not support the HTML5 canvas tag.</canvas>
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<script>
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var c = document.getElementById("myCanvas");
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var ctx = c.getContext("2d");
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ctx.canvas.width = window.innerWidth;
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ctx.canvas.height = window.innerHeight;
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var m = 250;
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var s = 1;
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var u = 10;
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var t = 0;
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var w = 160;
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var h = 100;
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var x = 0;
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var x2 = 0;
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var sdt = 3;
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var st = 3;
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var sdt2 = 3;
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var st2 = 3;
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var sr = 5;
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var six = -100;
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var dist = 150;
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var snowballPositions = new Array();
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var snowballDirections = new Array();
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var snowballPositions2 = new Array();
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var snowballDirections2 = new Array();
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var dt = 0.1;
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var xPos = -200;
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var yPos = 100;
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ctx.translate(ctx.canvas.width / 2, ctx.canvas.height / 2);
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ctx.scale(1.5, 1.5);
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function Clear(ctx)
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{
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ctx.clearRect(-c.width, -c.height, c.width * 2, c.height * 2);
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}
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function Update()
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{
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Clear(ctx);
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Draw();
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Draw2();
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t += dt;
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st += dt;
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st2 += dt;
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x = calcX(t);
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x2 = calcX2(t);
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setTimeout(Update, 1000/60)
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}
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function calcX(gt)
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{
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return u * gt - m * u * Math.log(1 + 2 * s * gt / m) / (2 * s);
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}
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function Draw()
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{
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ctx.beginPath();
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ctx.rect(xPos + x - w / 2, yPos - h / 2, w, h);
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ctx.stroke();
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ctx.beginPath();
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ctx.arc(xPos + x - w / 4 - h/8, yPos + h / 2 + h / 8, h/8, 0, Math.PI * 2);
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ctx.stroke();
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ctx.beginPath();
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ctx.arc(xPos + x + w / 4 + h/8, yPos + h / 2 + h / 8, h/8, 0, Math.PI * 2);
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ctx.stroke();
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if (st > sdt)
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{
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st -= sdt;
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snowballPositions.push(six);
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snowballDirections.push(1);
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}
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for (i = 0; i < snowballPositions.length; i++)
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{
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if (snowballPositions[i] < x - w/2 - sr || snowballDirections[i] == -1)
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{
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snowballPositions[i] += u * dt * snowballDirections[i];
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} else
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{
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snowballDirections[i] = -1;
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}
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ctx.beginPath();
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ctx.arc(xPos + snowballPositions[i], yPos - h/4, sr, 0, Math.PI * 2);
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ctx.stroke();
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}
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}
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function calcX2(gt)
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{
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return u * gt - m * u * Math.sqrt(1 + 2 * s * gt / m) / (s) + m * u / s;
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}
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function Draw2()
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{
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ctx.beginPath();
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ctx.rect(xPos + x2 - w / 2, yPos - h / 2 - dist, w, h);
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ctx.stroke();
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ctx.beginPath();
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ctx.arc(xPos + x2 - w / 4 - h/8, yPos + h / 2 + h / 8 - dist, h/8, 0, Math.PI * 2);
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ctx.stroke();
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ctx.beginPath();
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ctx.arc(xPos + x2 + w / 4 + h/8, yPos + h / 2 + h / 8 - dist, h/8, 0, Math.PI * 2);
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ctx.stroke();
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if (st2 > sdt)
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{
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st2 -= sdt;
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snowballPositions2.push(six);
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snowballDirections2.push(1);
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}
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for (i = 0; i < snowballPositions2.length; i++)
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{
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y = -h/4;
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if (snowballPositions2[i] < x2 - w/2 - sr)
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{
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snowballPositions2[i] += u * dt * snowballDirections2[i];
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} else
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{
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snowballDirections2[i] = 0;
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nr = Math.floor(w / (2 * sr));
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snowballPositions2[i] = x2 - w/2 + sr + 2 * sr * (i % nr);
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y = h/2 - sr - 2 * sr * Math.floor(i / nr);
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}
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ctx.beginPath();
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ctx.arc(xPos + snowballPositions2[i], yPos + y - dist, sr, 0, Math.PI * 2);
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ctx.stroke();
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}
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}
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window.addEventListener('resize', function(event) {
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c.width = window.innerWidth;
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c.height = window.innerHeight;
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ctx.translate(c.width / 2, c.height / 2);
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}, true);
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Update();
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</script>
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</body>
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<p xmlns:cc="http://creativecommons.org/ns#" style="font-size: 1vw; bottom: 0px; position: absolute;">
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This work is licensed under
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<a href="http://creativecommons.org/licenses/by-nc-nd/4.0/?ref=chooser-v1" target="_blank" rel="license noopener noreferrer" style="display:inline-block;">CC BY-NC-ND 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/nd.svg?ref=chooser-v1"></a></p>
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</html> |