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20 <code class="code"><span class="keyword">let</span>&nbsp;signal_select2&nbsp;si&nbsp;s0&nbsp;s1&nbsp;=&nbsp;<br>
21 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">let</span>&nbsp;f&nbsp;=&nbsp;signal_check_frequency3&nbsp;si&nbsp;s0&nbsp;s1&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;<br>
23 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">if</span>&nbsp;(signal_fun&nbsp;si)&nbsp;t&nbsp;=&nbsp;<span class="constructor">N</span>&nbsp;0&nbsp;<span class="keyword">then</span>&nbsp;(signal_fun&nbsp;s0)&nbsp;t<br>
24 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">else</span>&nbsp;<span class="keyword">if</span>&nbsp;(signal_fun&nbsp;si)&nbsp;t&nbsp;=&nbsp;<span class="constructor">N</span>&nbsp;1&nbsp;<span class="keyword">then</span>&nbsp;(signal_fun&nbsp;s1)&nbsp;t<br>
25 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">else</span>&nbsp;raise&nbsp;(<span class="constructor">Signal_operation</span>&nbsp;<span class="string">"select2&nbsp;index&nbsp;should&nbsp;be&nbsp;0&nbsp;or&nbsp;1."</span>)<br>
26 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">in</span><br>
27 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(f,&nbsp;new_signal)</code></body></html>