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courses/index.html

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             <div class="header" id="top">
                 <a href="http://linsenwang.com/">Linsen Wang</a>
             </div>
-            <div class="contenta">
-                <div class="header">
-                    <a href="./playground">Playground</a>
-                </div>
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-                <p>Percolation: a Mathematical Phase Transition
-                    <a href="https://www.bilibili.com/video/BV1op4y1E7qM">@bilibili</a>
-                </p>
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-                <div class="img">
-                    <a href="https://www.bilibili.com/video/BV1op4y1E7qM"><img src="../pg1.webp"/></a>
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-            <div class="contenta">
-                <p>Starship | Second Integrated Flight Test
-                    <a href="https://www.bilibili.com/video/BV1DC4y1j7QE">@bilibili</a>
-                </p>
-                <div class="img">
-                    <a href="https://www.bilibili.com/video/BV1DC4y1j7QE"><img src="../pg2.webp"/></a>
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-            <div class="contenta">
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-                    <a href="./playground">More -></a>
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             <div class="contenta">
                 <p>Quantecon
-                    <a href="https://www.bilibili.com/video/BV1DC4y1j7QE">@Official website</a>
+                    <a href="https://www.bilibili.com/video/BV1DC4y1j7QE">@official website</a>
                 </p>
                 <div class="img">
                     <a href="https://www.bilibili.com/video/BV1DC4y1j7QE"><img src="../cr2.jpg"/></a>
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-                    <a href="./courses">More -></a>
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-                    <a href="./projects">Projects</a>
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-                <p>WISE 2022 Visual Identity
-                    <a href="./projects">@detail</a>
-                </p>
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-                <div class="img">
-                    <a href="./projects"><img src="../pr1.jpg"/></a>
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             <div class="contenta">
-                <p>Sanmu Choir Visual Identity
-                    <a href="./projects">@detail</a>
+                <p>Principles of Economics
+                    <a href="https://www.bilibili.com/video/BV1oE411Z7TU">@official website</a>
                 </p>
 
                 <div class="img">
-                    <a href="./projects"><img src="../pr2.jpg"/></a>
+                    <a href="https://www.bilibili.com/video/BV1oE411Z7TU"><img src="../cr3.jpg"/></a>
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             <div class="contenta">
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-                    <a href="./projects">More -></a>
+                    <a href="./courses">More -></a>
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