what is string.setStr1/2/3(calledString) do ?? and what will return string; return? : <pre><code>TripleString pull()
{
   string calledString;
   TripleString string;
   calledString = randString();
   string.setStr1(calledString);
   calledString = randString();
   string.setStr2(calledString);
   calledString = randString();
   string.setStr3(calledString);
   calledString = randString();
   return string;
}
</code></pre>

<p>This method is used to get the random string from randString() and see if it meets the requirement by using string.setStr();</p>
