sp;ppf&nbsp;l</code> prints the lines in <code class="code">l</code> as two
   columns separated by <code class="code">sep</code> ("|" by default). <code class="code">max_lines</code> can be used to
   indicate a maximum number of lines to print -- an ellipsis gets inserted at
   the middle if the input has too many lines.</p>

<p>Example:</p>

<pre class="verbatim">pp_two_columns ~max_lines:3 Format.std_formatter [
      "abc", "hello";
      "def", "zzz";
      "a"  , "bllbl";
      "bb" , "dddddd";
    ]