>
        Overloaded method for vertical concatenation of convex sets. It is not possible 
        to concatenate objects of different type to the same array (e.g. <tt>Polyhedron</tt> and <tt>YSet</tt>). 
        Similarly, it is not possible to concatenate into matrices, only vectors are allowed.
    <h2>Input Arguments</h2>
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<td><tt>S1</tt></td>
<