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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Programming</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <style>
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
                   Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
      background: #fafafa;
      color: #222;
      line-height: 1.6;
      padding: 2rem;
    }

    .container {
      max-width: 900px;
      margin: auto;
    }

    .notice {
      background: #fffbe6;
      border-left: 4px solid #f5c542;
      padding: 1rem;
      margin-bottom: 2rem;
    }

    pre {
      background: #f4f4f4;
      padding: 1.25rem;
      border-radius: 6px;
      font-family: Consolas, Monaco, "Andale Mono", monospace;
      font-size: 0.95rem;
      position: relative;
      overflow-x: auto;
    }

    .kw { color: #0000cd; font-weight: bold; }
    .num { color: #d91e18; }

    /*
      This is the key trick:
      - Invisible on screen
      - Still present in selection & clipboard
    */
    .copy-only {
      position: absolute;
      left: -9999px;
      width: 1px;
      height: 1px;
      overflow: hidden;
    }

    textarea {
      width: 100%;
      min-height: 90px;
      margin-top: 1rem;
      font-family: Consolas, Monaco, monospace;
      padding: 0.75rem;
    }

    footer {
      margin-top: 3rem;
      font-size: 0.85rem;
      color: #666;
    }
  </style>
</head>

<body>
  <div class="container">
    <h1>Programming Reasoning Challenge</h1>

    <pre id="challenge-code">
result = <span class="num">0</span>
<span class="kw">for</span> x <span class="kw">in</span> [<span class="num">3</span>, <span class="num">3</span>, <span class="num">5</span>]:
    <span class="kw">if</span> x &gt;<span class="copy-only">=</span> <span class="num">3</span>:
        result = result - x
    <span class="kw">else</span>:
        result = result + x
    </pre>

    <p><strong>Question:</strong> What is the final value of <code>result</code>?</p>

    <footer>
      Reasoning &gt; execution.
    </footer>
  </div>

</body>
</html>