ode class="code">exists p [a1; ...; an]</code> checks if at least one element of
   the list satisfies the predicate <code class="code">p</code>. That is, it returns
   <code class="code">(p a1) <span class="keywordsign">||</span> (p a2) <span class="keywordsign">||</span> ... <span class="keywordsign">||</span> (p an)</code>.<br>
</div>
<pre><span id="VALfor_all2"><span class="keyword">val</span> for_all2</span> : <code class="type">('a -&gt; 'b -&gt; bool) -&gt; 'a list -&gt; 'b list -&gt; bool</code></pr