fix: replace .chinese.md extension with .md
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---
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id: 5900f4371000cf542c50ff49
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challengeType: 5
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title: 'Problem 202: Laserbeam'
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videoUrl: ''
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localeTitle: 问题202:Laserbeam
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---
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## Description
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<section id="description">三个镜子以等边三角形的形状排列,其反射表面指向内侧。在三角形的每个顶点处存在无穷小的间隙,激光束可以通过该间隙。 <p>标记顶点A,B和C.有两种方式可以使激光束进入顶点C,从11个表面反弹,然后通过相同的顶点退出:下面显示了一种方式;另一方面与此相反。 </p><p>有80840种方式,激光束可以进入顶点C,从1000001表面反弹,然后通过相同的顶点退出。 </p><p>激光束在顶点C进入的方式有多少,从12017639147表面反弹,然后通过相同的顶点退出? </p></section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>euler202()</code>应返回1209002624。
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testString: assert.strictEqual(euler202(), 1209002624);
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function euler202() {
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// Good luck!
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return true;
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}
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euler202();
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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/section>
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