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    <a class="dropdown-item" href="../articles/a_intro_progrbasics_en.html">1 - Introduction and programming basics</a>
    <a class="dropdown-item" href="../articles/b_meetingkarel_en.html">2 - Meeting Karel</a>
    <a class="dropdown-item" href="../articles/c_decomposition_en.html">3 - Algorithmic decomposition</a>
    <a class="dropdown-item" href="../articles/d_controlstructures_en.html">4 - Control structures</a>
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