an> <span class='kw'>true</span>
    <span class='id identifier rubyid_s'>s</span><span class='period'>.</span><span class='id identifier rubyid_flip_vertically'>flip_vertically</span> <span class='op'>=</span> <span class='kw'>true</span>
  <span class='kw'>end</span>

  <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_lower_left_corner'>lower_left_corner</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="../Zif.html" title="Zif