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  20 <code class="code"><span class="keyword">let</span>&nbsp;signal_add&nbsp;s1&nbsp;s2&nbsp;=&nbsp;<br>
  21 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;f&nbsp;=&nbsp;signal_check_frequency&nbsp;s1&nbsp;s2&nbsp;<span class="keyword">in</span><br>
  22 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;new_signal&nbsp;=&nbsp;<span class="keyword">fun</span>&nbsp;t&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;((signal_fun&nbsp;s1)&nbsp;t)&nbsp;+~&nbsp;((signal_fun&nbsp;s2)&nbsp;t)&nbsp;<span class="keyword">in</span><br>
  23 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f,&nbsp;new_signal)</code></body></html>