n class="n">B_PHI</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">*</span><span class="n">sP</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span>
     <span class="n">B_Y</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span> <span class="o">=</span> <span class="n">B_R</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">*</span><span class="n">sP</span><span class="p