public/index.html

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<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
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    <title>Симуляция миссии</title>
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      href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"
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    <div id="appSimulation"></div>
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</html>