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17 <link title=
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</title>
20 <code class=
"code"><span class=
"keyword">let
</span> signal_check_frequency3
=
<span class=
"keyword">fun
</span> s1
<span class=
"keywordsign">-
></span> <span class=
"keyword">fun
</span> s2
<span class=
"keywordsign">-
></span> <span class=
"keyword">fun
</span> s3
<span class=
"keywordsign">-
></span><br>
21 <span class=
"keyword">let
</span> f1
=
signal_check_frequency
s1
s2
<span class=
"keyword">in
</span><br>
22 <span class=
"keyword">let
</span> f2
=
signal_check_frequency
s1
s3
<span class=
"keyword">in
</span><br>
23 check_frequency
f1
f2
</code></body></html>