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20 <code class="code"><span class="keyword">let</span>&nbsp;check_frequency&nbsp;=&nbsp;<span class="keyword">fun</span>&nbsp;f1&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keyword">fun</span>&nbsp;f2&nbsp;<span class="keywordsign">-&gt;</span><br>
21 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">if</span>&nbsp;f1&nbsp;=&nbsp;f2&nbsp;<span class="keywordsign">||</span>&nbsp;f2&nbsp;=&nbsp;0&nbsp;<span class="keyword">then</span>&nbsp;f1<br>
22 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">else</span>&nbsp;<span class="keyword">if</span>&nbsp;f1&nbsp;=&nbsp;0&nbsp;<span class="keyword">then</span>&nbsp;f2<br>
23 &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">"frequency&nbsp;not&nbsp;matched."</span>)</code></body></html>