protected function _skip($skips)
{
$skipped = '';
$count = $this->count();
while ($this->_current < $count) {
if (!isset($skips[$this->_data[$this->_current][0]])) {
break;
}
$skipped .= $this->_data[$this->_current][1];
$this->_current++;
}
return $skipped;
}