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  <ul class="dropdown-menu" aria-labelledby="dropdown-articles"><li><a class="dropdown-item" href="../articles/z1_install.html">1 - Installing Rvision</a></li>
    <li><a class="dropdown-item" href="../articles/z2_io.html">2 - Input/output operations</a></li>
    <li><a class="dropdown-item" href="../articles/z3_basic.html">3 - Basic operations</a></li>
    <li><a class="dropdown-item" href="../articles/z4_i