protected function placeAbbrevsCleanAbbrev($s)
{
// remove accents must be called before mb_strtolower; otherwise the German SS isn't handled correctly
$s = StructuredData::removeAccents($s);
$s = Place::placeAbbrevsClean($s);
$s = mb_strtolower($s);
$s = StructuredData::mb_str_replace($s, "'", '');
$s = preg_replace('/[^a-z0-9]/', ' ', $s);
$s = preg_replace('/\\s+/', ' ', $s);
$s = trim($s);
return $s;
}
