the output sequence to the input sequence. The beginning of
          the output sequence is advanced by <code class="computeroutput"><span class="identifier">n</span></code>
          characters.
        </p>
<p>
          Requires a preceding call <code class="computeroutput"><span class="identifier">prepare</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span></code>
          where <code class="computeroutput"><span class="identifier">x</span> <span class="s