>Skip \(\bc\) if <p class="formulaDsp">
\[ UB_i \leq \frac{1}{2} \| \bc_{q_i} - \bc \| \quad\text{or}\quad UB_i \leq LB_i(\bc). \]
</p>
 The first condition reflects the first observation above; the second uses the bounds to decide if \(\bc\) can be closer than the current center \(\bc_{q_i}\) to the point \(\bx_i\). If the center cannot be skipped, continue as follows.</li>
<li>Skip \(\bc\) if the condition above is satisfied after making the upper bound tight: <p class="formulaDsp">
\[ UB_i = LB_i(\bc_{q_